ANYCUBIC Tough Resin 2.0
4.6Editor score
Enhanced flexural strength
Low-shrinkage detailed printing
Broad LCD and DLP compatibility
In this guide
Flexible resin for 3D printing gives makers a practical way to create rubber-like parts that can bend, compress, rebound, and withstand repeated handling. Unlike ordinary rigid photopolymer resin, a genuinely flexible formulation is useful for gaskets, grips, cushioning, articulated models, protective components, prototypes, and other designs that need controlled movement without snapping.
This guide compares ten flexible or tough resin products using the supplied specifications, including Shore hardness, elongation, impact resistance, rebound behavior, cure characteristics, surface quality, and compatibility with LCD, DLP, and SLA printers. It also considers whether a resin is intended for direct flexible printing, tougher rigid prototyping, or use as a strengthening additive to another formulation.
Each pick reveals a different practical balance: softer 55A and 70A options prioritize pliability, while 80A, 84.7D, and 90A products offer greater stiffness and durability. The ratings and available specifications are used as reference points rather than the sole basis for selection. Prices and promotions can change, so check the current listing before ordering.
Top 3 Picks for Best Flexible Resin for 3D Printing
ANYCUBIC Ultra Tough Resin
4.7Editor score
Exceptional flexibility and resilience
Strong impact and abrasion resistance
Useful as direct resin or additive
Siraya Tech Rebound 55A
4.2Editor score
Soft 55A Shore hardness
Fast rebound after deformation
Simple standard-printer workflow
Top 10 Best Flexible Resin for 3D Printing in 2026 Compared
The comparison below highlights each resin's intended balance of softness, strength, elasticity, finish, and equipment support, helping you narrow the field before examining the individual reviews.
ProductsSpecificationsEditor scorePrice
Best Budget
Superflex 80A Resin
80A Shore hardness
100% elongation
50-micron layers
ISO 10993-5 tested
4.4Editor score
Editor's Choice
ANYCUBIC Ultra Tough
Direct-use tough resin
Exceptional elasticity
Impact resistant
Blendable additive
4.7Editor score
Best Premium
SUNLU Flexible 70A
70A Shore hardness
135% elongation
365-405nm curing
Low-shrinkage formulation
3.5Editor score
Siraya Tenacious Flex
Rubber-like flexibility
Fast elastic rebound
High impact resistance
Resin blending support
4.7Editor score
ANYCUBIC Tough 2.0 Grey
High flexural strength
Low-shrinkage printing
365-405nm curing
Low-odor formulation
4.6Editor score
SUNLU High Toughness
Five-times elongation
Low viscosity
405nm curing
Broad printer compatibility
4.7Editor score
ELEGOO Tough Resin
84.7D Shore hardness
Drillable cured parts
Impact resistant
Humidity resistant
4.5Editor score
Siraya Rebound 55A
55A Shore hardness
Fast shape recovery
Standard 405nm curing
No A/B mixing required
4.2Editor score
ANYCUBIC Tough 2.0 Clear
Enhanced flexural strength
Exceptional stretch
Low-shrinkage printing
Multi-resolution compatible
4.6Editor score
FUNCECOL Flexible 90A
90A Shore hardness
High tear resistance
High elongation
405nm UV curing
4.4Editor score
1. Superflex 80A Resin – Best Balanced Flexible Formulation
Superflex 80A Resin
80A Shore hardness
100% elongation
50-micron layer speed
ISO 10993-5 tested
Superflex 80A Resin is a flexible photopolymer with a 4.4 rating and a notably balanced specification set. Its 80A Shore hardness makes it firmer than the softest options in this guide while remaining far more bendable than conventional brittle resin. The stated 100% elongation at break is particularly useful for designs expected to flex repeatedly.
Pros
- Balanced softness and strength
- Excellent elongation properties
- Fast 50-micron printing
- Suitable for cushioning
- Documented biocompatibility test
Cons
- Clear color may limit hiding defects
- Post-curing remains essential
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Its headline advantage is fast curing at a 50-micron layer, reportedly taking 1.7 seconds with compatible monochrome LCD printers. This can improve throughput for users who need many flexible prototypes or functional samples. The formulation is also described as suitable for cushioning, damping, and shock absorption, giving it a clear purpose beyond decorative models.
One important qualification is that properly cleaned and fully post-cured prints are the condition under which the product passes the stated ISO 10993-5 test. That makes careful post-processing particularly important. The resin is also sold in a clear color, which can reveal bubbles, surface irregularities, or incomplete curing more readily than an opaque formulation would.
This is a strong choice for makers who want dependable flexibility without the very soft handling of 55A or 70A resin. It suits repeated bending, flexible housings, vibration-isolating parts, and rubber-like prototypes. Choose it when speed, elongation, and moderate hardness are more important than the extreme softness associated with the softest elastomers.
Fast Production of Flexible Parts
The stated 1.7-second curing time for a 50-micron layer with a monochrome LCD printer makes Superflex attractive for small production runs. Confirm that your printer can deliver the required layer cure speed before relying on that specification.
Elasticity With Practical Toughness
An 80A durometer and 100% elongation create a useful middle ground between soft foam-like materials and rigid engineering resins. The result is well suited to cushions, damping elements, and shock-absorbing prototypes that must survive handling.
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2. ANYCUBIC Ultra Tough – Most Versatile Tough-Flex Resin
ANYCUBIC Ultra Tough
Direct-use or blended resin
High impact resistance
Rapid shape recovery
Corrosion resistant
ANYCUBIC Ultra Tough Resin carries a 4.7 rating and stands out for offering two distinct roles. It can be printed directly as a tough, flexible material, or blended with another resin to improve its toughness and durability. That versatility makes it useful for both finished parts and as an experimental modifier.
Pros
- Exceptionally versatile use
- Excellent toughness and flexibility
- Recovers rapidly from deformation
- Supports wearable designs
- Blendable with other resins
Cons
- Blending can alter final colors
- Not presented with a fixed Shore rating
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The material's central strengths are impact resistance, flexibility, and resilience. According to the supplied information, it swiftly recovers its original shape after deformation, which is valuable for articulated models, wearable pieces, repeated-use components, and prototypes exposed to accidental knocks. It is also presented as capable of capturing sharp, hair-like textures.
The lack of a stated Shore durometer makes precise material comparison more difficult than with the 55A, 70A, 80A, and 90A products. That does not negate its practical strengths, but it means buyers should test a small sample if exact hardness matters. Users should also account for possible color shifts when mixing colors.
This is the strongest all-purpose choice in the guide for someone who wants flexible parts but also values impact durability and the option to modify other resins. It is particularly compelling for articulated figures, wearable accessories, action models, and functional prototypes that need to recover after bending.
One Resin, Several Workflows
Direct printing and blending make this unusually adaptable. A small addition to a compatible resin can improve toughness, while a larger proportion may support projects where flexibility and resilience are central to the design.
Built for Repeated Movement
Fast shape recovery separates a useful elastomer from a merely bendable material. That behavior makes the resin appealing for articulated models, wearable parts, and items expected to be compressed or handled repeatedly.
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3. SUNLU Flexible 70A – Best Soft Resin for Detailed Prototypes
SUNLU Flexible 70A
70A Shore hardness
135% elongation
365-405nm wavelength
Low resin shrinkage
SUNLU Flexible 70A Resin is a softer option with a 3.5 rating, a 70A Shore hardness, and a stated elongation at break of 135%. It is aimed at users who want bendable, rubber-like parts rather than merely fracture-resistant rigid models. The gray formulation is supplied in a one-kilogram container.
Pros
- High stated elongation
- Soft yet resistant to drops
- Smooth surface finish
- Wide printer compatibility
- Leak-resistant bottle design
Cons
- Lowest rating in this guide
- Flexible detail retention may vary
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Its specification list is extensive. The resin is described as balancing softness with strength, resisting impact and drops, producing a smooth finish after cleaning, and maintaining dimensional stability through low shrinkage. Compatibility is listed across 365-405nm LCD, DLP, and SLA printers, making it a broad option for common resin machines.
The product's rating is lower than those of the other selections, and the supplied information does not explain individual customer feedback. That makes it wise to validate surface detail, dimensional accuracy, and print settings with a test piece before committing to a large batch. Very soft geometries can also be more challenging to clean and post-cure.
SUNLU is most appropriate for soft prototypes, flexible decorative parts, and designs that need greater elongation than a rigid tough resin can provide. Buyers prioritizing the softest feel, broad wavelength compatibility, and a smooth result will find more to like here than those seeking a simple, universally predictable engineering specification.
A Soft but Durable Balance
The 70A rating positions the resin between very soft 55A material and firmer 80A options. Its stated 135% elongation and impact resistance make it attractive where substantial deformation is expected.
Broad Machine Compatibility
Support for 365-405nm curing covers common LCD, DLP, and SLA systems. Users should still verify exposure time, heated-bed requirements, and the printer manufacturer's resin recommendations.
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4. Siraya Tenacious Flex – Best Rubber-Like Resin with Fast Rebound
Siraya Tenacious Flex
Soft rubber-like formulation
Fast elastic rebound
High impact resistance
Blendable with tough resins
Siraya Tech Tenacious Flex Black has a 4.7 rating and is described as significantly softer and more rubber-like than the classic Tenacious resin. Its defining behavior is fast rebound and recovery after extreme bending or compression, making it a credible choice for dynamic prototypes rather than static decorative prints.
Pros
- Strong 4.7 customer rating
- Excellent elastic recovery
- Resists cracking under impact
- Suitable for soft grips
- Useful as a resin additive
Cons
- May not replace every classic Tenacious use
- No numeric Shore value supplied
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The supplied information emphasizes a combination of strength, flexibility, and impact resistance. It is positioned for soft grips, gaskets, shock-absorbing components, and pliable prototypes. The material can also be mixed with tough resins to improve impact resistance and flexibility, giving experienced users an additional way to tune performance.
One caution is that the manufacturer notes this formulation may not suit every application where the original Tenacious resin would normally be used. Since no numerical Shore hardness is provided, precise comparisons with the 70A or 80A options are difficult. Prototype the geometry because thin sections and supports can behave differently in a softer material.
This resin is a strong fit for makers prioritizing genuine elasticity and recovery. It is especially appealing for grips, flexible seals, damped components, and models that will be squeezed repeatedly. If fast rebound and rubber-like behavior matter more than a fixed hardness number, it deserves close consideration.
Elasticity That Recovers Quickly
Fast rebound helps a deformed part return toward its original shape instead of remaining bent. This makes the resin useful for dynamic parts, protective elements, and frequently handled prototypes.
Flexible Material Performance
The material combines flexibility with impact resistance, aiming to avoid the brittle cracking associated with standard resin. That balance is valuable for gaskets and shock-absorbing shapes that need to deform without tearing.
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5. ANYCUBIC Tough 2.0 Grey – Best Tough Resin for Thin Parts
ANYCUBIC Tough 2.0 Grey
Upgraded flexural strength
High elongation capability
Low-shrinkage formulation
365-405nm curing
ANYCUBIC Tough Resin 2.0 in gray is a 4.6-rated formulation designed around toughness, precision, and reduced fracture risk. It is less explicitly rubber-like than the 55A, 70A, or 80A products, making it most appropriate when a part needs substantial flexural strength but not extreme softness.
Pros
- Reduced fracture risk
- Resists cyclic vibration damage
- Smooth detailed finish
- Low-odor formulation
- Suitable for thin models
Cons
- Less soft than dedicated elastomers
- Exact Shore hardness unspecified
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The updated formulation reportedly improves flexural strength, resists peeling and cracking under cyclic vibration, and reduces breakage in thin or miniature components. Low shrinkage and smooth surfaces support precise results, while 365-405nm compatibility allows use with most LCD resin printers as well as compatible DLP and SLA systems.
The trade-off is that it belongs closer to the tough-resin end of this flexible category. If a design must stretch dramatically, compress deeply, or imitate soft rubber, a lower-hardness formulation will usually be more appropriate. The supplied listing also promotes a low-odor, non-irritating composition and reduced volatile organic compounds.
Choose this resin for functional prototypes, industrial spare parts, models, and thin components that need more durability than standard resin can offer. It is a strong middle ground for makers who value detail and low shrinkage but only need limited flexibility rather than true elastomeric behavior.
Reliability for Delicate Geometry
Improved flexural strength reduces the chance that narrow walls, miniature components, or cantilevered details will snap. This is especially useful for functional models subjected to vibration or repeated contact.
Precision-Focused Printing
Low shrinkage and a smooth surface help preserve intended dimensions and fine details. Keep the part orientation sensible, as flexural behavior can still vary with geometry and wall thickness.
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6. SUNLU High Toughness – Best Flow-Focused Durable Resin
SUNLU High Toughness
Five-times standard elongation
Low-viscosity formulation
Reduced curing shrinkage
405nm UV curing
SUNLU High Toughness Resin is a 4.7-rated gray formulation positioned for bendable, durable prints. It claims elongation five times higher than standard resin, while its low-viscosity composition is designed to improve flow, formation, and curing efficiency.
Pros
- High 4.7 rating
- Substantial elongation and bendability
- Low viscosity improves flow
- Reduced distortion and cracking
- Lower reported odor
Cons
- Hardness value not supplied
- Explicitly limited to 405nm curing
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Its low shrinkage reduces the chance of warped or distorted parts, and the manufacturer says this helps prevent cracking after washing and curing. The resin is also reported to produce crisp details, a lower odor, and compatibility with most LCD, DLP, and SLA resin printers. Those characteristics make it a broad functional choice.
Unlike the explicitly flexible products, this formulation does not provide a numerical Shore hardness, so buyers cannot directly place it on the softness spectrum. It is therefore best treated as a tough, bendable resin rather than a soft elastomer. Its stated 405nm range is narrower than products compatible with both 365nm and 405nm sources.
SUNLU is a good option for structural parts, solid models, jigs, and prototypes that need more durability than standard resin. It is especially appealing when low viscosity and smooth material flow are priorities, or when your printer operates with a standard 405nm source.
Improved Material Flow
Low viscosity helps resin move into smaller spaces and form models more consistently. That can be useful for thin features, intricate interiors, and parts with limited pathways for liquid resin.
Reduced Distortion After Curing
Lower volume shrinkage can improve dimensional stability and reduce post-processing cracks. Orientation and adequate support remain important, particularly for large or thin-walled components.
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7. ELEGOO Tough Resin – Best Drillable Resin for Functional Parts
ELEGOO Tough Resin
84.7D Shore hardness
High resilience and impact resistance
Drillable after curing
Humidity and corrosion resistance
ELEGOO Tough Resin has a 4.5 rating and a stated cured Shore hardness of 84.7D. That places it among the firmer selections here, emphasizing resilience, impact resistance, and practical durability over a soft rubber-like feel. Its black one-kilogram package is suited to functional parts and production-oriented prototypes.
Pros
- Exceptionally durable cured parts
- Can be drilled without cracking
- Resists brittleness and corrosion
- Fine textured surface
- Broad range of applications
Cons
- Firmer than soft elastomers
- Black color can hide internal voids
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A major practical benefit is that cured resin can be drilled without cracking. That detail makes it relevant for tools, jigs, fixtures, structural components, and parts that need holes fitted after printing. The material is also described as resistant to brittleness, softening, and corrosion in humid environments.
This resin will not satisfy every interpretation of flexible resin. The 84.7D figure indicates a relatively rigid material that can flex or withstand stress but should not be expected to behave like a 55A gasket or a 70A rubber prototype. Its fine texture may also be less visible on black prints, which can make internal flaws harder to inspect.
ELEGOO is best for makers seeking tough, drillable, dimensionally practical parts rather than maximum stretch. Choose it for structural prototypes, tool components, movable parts, hangers, fixtures, and end-use-adjacent projects where impact and environmental durability matter.
Machining-Friendly Cured Parts
The stated ability to drill cured parts without cracking adds valuable workshop flexibility. It makes drilled holes, fitted fasteners, and post-processing more realistic than with brittle standard resin.
Durability in Demanding Conditions
Resistance to corrosion, softening, and brittleness supports use in humid environments. While this is not a substitute for application-specific engineering validation, it is a stronger feature set for functional parts.
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8. Siraya Rebound 55A – Best Soft Premium Resin for Rebound
Siraya Rebound 55A
55A Shore hardness
Fast shape recovery
Standard 405nm printing
No two-part mixing
Siraya Tech Rebound 55A is the softest clearly rated option in this guide, with a 55A Shore hardness and a 4.2 customer rating. Its defining claim is faster rebound than standard elastic resins, making it relevant to projects where rapid shape recovery and impact absorption matter.
Pros
- Softest stated Shore rating
- Faster rebound than standard elastomers
- Simple single-resin workflow
- Cleans with standard alcohol methods
- Suitable for seals and shock absorbers
Cons
- Lower rating than leading picks
- Long-term performance still under study
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Unlike some flexible systems that require two-part mixing or complicated processing, this resin prints on standard 405nm LCD and DLP machines and cleans with familiar isopropyl alcohol methods. That simpler workflow is a meaningful advantage for users who want soft performance without a specialized mixing process.
The manufacturer notes that initial testing shows promising compression resilience, but long-term performance testing remains ongoing. That caveat matters most for repeated-use seals, personal protective equipment, and other parts expected to undergo many compression cycles. It is also a relatively soft product, so fine details and thin unsupported features may be more challenging.
This is the premium pick for prototypes that require a distinctly soft, rubber-like response: gaskets, seals, shock absorbers, wearable concepts, and consumer-product prototypes. It is particularly suitable when quick rebound and straightforward printing outweigh the need for a precisely quantified long-term fatigue rating.
Softness With Rapid Recovery
The 55A Shore rating provides a notably soft hand, while the fast-rebound formulation is intended to restore shape after compression. This combination is useful for seals, dampers, and flexible protective concepts.
No Specialized Mixing Required
Using the resin directly on standard 405nm LCD or DLP equipment simplifies the workflow. It avoids A/B mixing requirements, although normal washing, curing, and ventilation practices still apply.
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9. ANYCUBIC Tough 2.0 Clear – Best Value Tough and Precise Resin
ANYCUBIC Tough 2.0 Clear
Enhanced flexural strength
High flexibility and stretch
Low-shrinkage formulation
Wide resolution compatibility
ANYCUBIC Tough Resin 2.0 in clear is a 4.6-rated option with enhanced flexural strength and high precision. It is designed for components that need greater durability and flexibility than ordinary resin without requiring the very soft behavior of a dedicated elastomer.
Pros
- Strong 4.6 rating
- Good balance of detail and toughness
- Resists breakage after drops
- Wide printer compatibility
- Low-odor printing experience
Cons
- Not a soft 55A elastomer
- Clear finish reveals surface flaws
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The supplied specifications emphasize improved resistance to breakage, exceptional stretch, and resilience under cyclic vibration and drops. Low shrinkage supports accurate dimensions and clear detail, while 365-405nm curing and support for LCD, DLP, and SLA systems make it suitable for a broad range of equipment.
Its clear color offers useful visibility for bubbles, incomplete exposure, and surface defects but can make a flawless finish harder to achieve. It should not be interpreted as a 55A or 70A soft resin simply because it is marketed as flexible. The intended use is tougher prototyping, including delicate and thin parts.
This is the budget pick for users who want a dependable balance of strength, stretch, and precision. It works well for functional prototypes, miniatures, vibration-affected parts, and models that need to survive being dropped without behaving like soft rubber.
Toughness for Thin Components
Improved flexural strength reduces failure risk in narrow walls and small parts. That makes this formulation useful when a print needs enough give to survive a drop without snapping.
Clear Output for Inspection
A clear formulation can make internal flaws and bubbles easier to identify. It also creates attractive prototypes for presentation, provided the surface is cleaned and cured carefully.
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10. FUNCECOL Flexible 90A – Best Firm Rubber-Like Resin for Durability
FUNCECOL Flexible 90A
90A Shore hardness
High tear resistance
High elongation capability
405nm UV curing
FUNCECOL Flexible 90A Resin is a 4.4-rated, black formulation with a stated 90A Shore hardness. It occupies the firm end of the flexible range, aiming to combine the bendability of rubber-like material with better tear resistance and dimensional control than very soft resins.
Pros
- Firm yet flexible rubber feel
- Resists repeated bending and tearing
- Suitable for grips and gaskets
- Maintains detailed finish
- Broad LCD and DLP support
Cons
- Firmest flexible formulation listed
- Not suited to deep compression
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The resin is promoted for repeated folding, cushioning, shock absorption, gaskets, protective cases, toy tires, shoe soles, and ergonomic grips. High elongation and tear resistance are its main performance claims, while high precision and a low-odor formula address common user concerns. Compatibility covers most LCD and DLP printers using 405nm curing.
Because 90A is relatively firm, this product is best for designs that must retain their shape while remaining flexible. It is less appropriate for deep compression, soft skin contact, or simulations of very soft elastomers. Detail quality can also be affected by support marks on flexible surfaces, so print orientation and cleanup deserve attention.
Choose FUNCECOL for durable, frequently handled rubber-like parts that need a firmer hand than the 55A, 70A, or 80A options. It is particularly relevant to grips, tire concepts, protective housings, and prototypes that must survive repeated bending without tearing.
Firm Rubber for Repeated Use
The 90A hardness offers more shape retention than softer formulations. It is a sensible middle ground for functional grips and protective parts that need flexibility without excessive deformation.
Tear Resistance and Detail
The combination of elongation, tear strength, and a high-precision finish targets parts that are repeatedly stressed while retaining their appearance. Careful washing and curing are essential for a clean final surface.
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Buying Guide – How to Choose the Best Flexible Resin for 3D Printing
The right flexible resin depends on how far the part must bend, how much impact it must survive, how precisely it should hold a shape, and how your printer handles the material. Use the specifications below to narrow the field before validating a small test print.
Choose the Right Hardness
Shore hardness provides the clearest way to compare softness among the listed products. The 55A Siraya Rebound option is the softest, followed by SUNLU at 70A, Superflex at 80A, and FUNCECOL at 90A. ELEGOO's 84.7D rating indicates a tougher, less rubber-like material. Products without a fixed rating may be difficult to place precisely on this scale. Match the formulation to the job: soft grades suit seals and cushions, while harder grades work better for grips, housings, and parts that retain a defined shape.
Choose softness by function rather than by the word flexible. A working prototype should bend where your design expects it to bend and remain firm elsewhere.
Assess Elongation and Recovery
Elongation describes how far a material can stretch before failure, while rebound describes how quickly it returns toward its original shape. SUNLU Flexible lists 135% elongation, Superflex lists 100%, and Superflex also emphasizes recovery after deformation. Siraya Tenacious Flex and Siraya Rebound focus on fast rebound. These properties are especially important for gaskets, cushions, wearable pieces, and articulated models because they repeatedly compress, bend, or move.
Do not treat elongation as a guarantee of service life. Repeated fatigue, temperature, exposure, geometry, and print quality all affect real-world performance, so test under conditions that resemble the intended use.
Balance Flexibility With Toughness
A flexible resin should resist cracking and tearing, not simply bend until it breaks. ANYCUBIC Ultra Tough, Siraya Tenacious Flex, SUNLU High Toughness, and ELEGOO Tough all emphasize impact resistance or resilience alongside flexibility. These characteristics suit tools, articulated models, protective parts, and components expected to be dropped or handled. Purely soft elastomers can feel pleasant but still tear quickly if walls are thin.
Look for the combination of elongation, impact resistance, and toughness rather than softness alone. That combination usually produces a more useful prototype.
Confirm Printer and Curing Compatibility
Many selections support standard 365-405nm curing, but the exact range differs. SUNLU Flexible covers 365-405nm and is described as compatible with LCD, DLP, and SLA printers. FUNCECOL is specified for 405nm systems, while SUNLU High Toughness is also described around 405nm curing. Check the light source, printer size, resin vat, heated-bed behavior, and manufacturer recommendations before purchasing. A resin being physically compatible does not mean every printer profile or exposure setting will be ideal.
Use the supplied wavelength information as a first filter, then verify the printer and software documentation. Unsupported wavelengths can lead to under-cured, soft, or uneven prints.
Consider Printing Speed and Accuracy
Superflex specifies a 50-micron layer cured in 1.7 seconds on compatible monochrome LCD printers, making speed a notable benefit for production-oriented users. SUNLU High Toughness uses low viscosity and strong flow to improve model formation, while several tough resins advertise low shrinkage and smooth, detailed results. Clear resins can expose bubbles and incomplete curing, whereas black or gray formulations can disguise small surface defects. Balance throughput, surface quality, and inspection needs rather than optimizing one factor alone.
Fast curing is most useful when your geometry and printer can maintain stable exposure. Detail quality still depends on layer height, orientation, supports, washing, and post-curing.
Evaluate Surface Finish and Odor
Low-odor formulations are highlighted for ANYCUBIC Tough 2.0, SUNLU High Toughness, and ELEGOO Tough. While these claims can improve comfort, ventilation remains necessary with UV photopolymer resin. SUNLU Flexible describes a non-pungent aromatic odor, and its cured surface is said to become dry and non-sticky after cleaning. Surface texture matters for wearables, display models, and parts handled frequently, where tackiness or support marks can reduce usability.
Always cure and wash the print according to the product instructions, and inspect it under good lighting. A low-odor bottle does not make uncured resin safe to touch.
Check Intended Application
Some products are optimized for direct flexible printing, while others are marketed as additives that can be blended with standard or tough resins. ANYCUBIC Ultra Tough works directly or as an additive. Siraya Tenacious Flex can also be mixed with tough resins to increase impact resistance and flexibility. Direct-use products are simpler and easier to evaluate, while blended formulations may provide a better balance for specialized prototypes. Color changes can occur when different colors are mixed.
Choose a direct resin when you want predictable results and minimal experimentation. Consider additives only when you can test and document the ratio.
Understand Post-Curing Requirements
Flexible resin generally requires thorough washing and post-curing to reach its final mechanical properties. Superflex's stated ISO 10993-5 result applies to properly cleaned and fully post-cured prints, illustrating how processing affects the finished material. Soft parts can distort during washing, support removal, or curing if they are not positioned carefully. UV exposure, ventilation, gloves, and safe handling are necessary throughout the workflow.
Treat post-curing as part of the material system rather than an optional finishing step. Test the full process before evaluating softness, detail, or strength.
How to Use and Care for Your Flexible Resin for 3D Printing
Prepare the workspace with the printer, resin, gloves, a tray, and suitable ventilation before opening the bottle. Stir the resin thoroughly, but avoid introducing bubbles, and pour only the amount needed for the job. Secure the vat, level the build platform, and confirm that the printer's wavelength and settings are compatible with the selected formulation.
Load a sliced model with realistic exposure, layer height, supports, and orientation for the product. Flexible parts often benefit from geometry that avoids sharp unsupported sections and excessive thin walls. Print a small calibration or coupon first, then inspect the surface for dry spots, bubbles, incomplete layers, and excessive supports before committing to a full model.
After printing, remove the part carefully and wash it using the manufacturer's recommended method. Support removal can stress thin flexible features, so work gradually with suitable tools. Complete the required UV post-curing, then allow the part to cool and fully settle before testing its flexibility. Clean the vat and store the bottle sealed in a cool, dry place, following the label's storage and disposal guidance.
Frequently Asked Questions
What is the softest flexible resin in this guide?
Siraya Tech Rebound 55A has the lowest stated Shore hardness at 55A. It is designed for soft, elastic applications such as gaskets, seals, shock-absorbing prototypes, and wearables. Its lower customer rating and the availability of the material's long-term performance data should be considered before committing to an application that requires extensive repeated cycling.
Is 55A resin better than 90A resin for every flexible project?
No. A 55A resin is softer, more compressible, and generally better for seals, cushioning, and skin-contact concepts. A 90A resin retains shape better and can be more resistant to tearing under repeated bending, making it useful for grips, protective cases, and tire-like parts. The correct choice depends on how much deformation the design must tolerate.
Can tough resin be used as a genuinely flexible material?
Tough resin can flex and resist fracture, but it is not automatically as soft or stretchable as a dedicated elastomer. Products such as ANYCUBIC Ultra Tough and Siraya Tenacious Flex bridge this distinction, while products like ANYCUBIC Tough Resin 2.0 prioritize strength and dimensional performance. Review the stated hardness, elongation, and rebound characteristics.
Can I mix flexible resin with standard resin?
Some products explicitly support blending. ANYCUBIC Ultra Tough can serve as an additive, and Siraya Tenacious Flex can be mixed with tough resins to improve flexibility and impact resistance. Different colors may shift the final appearance, so use controlled test batches and document the ratio before relying on a mixture for critical parts.
Will every resin printer work with flexible resin?
Most modern LCD, DLP, and SLA resin printers can use flexible formulations, but the curing wavelength and machine requirements still matter. Several products support 365-405nm, while others specify 405nm. Always verify the light source, printer recommendations, vat compatibility, and exposure settings before using a new resin.
How do I prevent flexible prints from becoming sticky?
Incomplete washing and curing can leave a tacky surface. Wash the print thoroughly using the material's recommended cleaning method, remove supports carefully, and complete the specified post-curing process. Support orientation and trapped resin can also affect cleanup, so test a simple part and adjust orientation before printing intricate models.
Does flexible resin preserve fine details?
It can, but very soft materials may show more support marks or lose tiny unsupported features. Low-viscosity and low-shrinkage formulations can improve flow and dimensional stability. Choose a suitable layer height, orient the model to minimize supports, and judge the result only after complete washing and curing.
Can I use flexible resin for functional end-use parts?
The selected resins are marketed for functional prototypes and various real-world applications, but general listings are not a substitute for engineering validation. Test the exact geometry, environment, loading, and cleaning requirements. For safety-critical or high-load use, verify material data and seek application-specific professional guidance.
Final Thoughts on Choosing the Best Flexible Resin for 3D Printing
ANYCUBIC Ultra Tough is the most versatile top pick because it combines strong elasticity, impact resistance, direct use, and additive capability. ANYCUBIC Tough Resin 2.0 in clear is the budget-oriented choice for makers seeking toughness, stretch, precision, and broad printer compatibility, while Siraya Rebound 55A takes the premium slot for projects that prioritize genuinely soft, fast-rebound behavior.
For softer prototypes, focus on the 55A, 70A, and 80A products and compare elongation, rebound, and drop resistance. For functional components that need more shape retention or drilling, consider 84.7D, 90A, and tough-resin alternatives. Always print a representative test coupon because orientation, wall thickness, cleaning, and post-curing can materially affect the finished part.
Ratings and specifications provide a useful starting point, but current availability and prices change over time. Check the latest listing, seller information, package size, and manufacturer instructions before buying. The right flexible resin is the one that matches the required softness, durability, finish, and printer workflow for your project.