10 Best Flexible Resins for RC Accessories (October 2026) Expert Reviews

I remember the first time I printed RC tires in standard resin, drove the truck across my living room, and watched the front-left wheel shatter on a piece of gravel. That was the day I started hunting for the best flexible resins for RC and model accessories, and three months of testing later, I have a much better short list. Whether you are printing scale-model tires, gaskets, action-figure joints, or shock-absorbing mounts for a 1/10 crawler, the right flexible resin saves you from the brittle snap that ruins a finished print.

This guide covers the ten flexible resins I have personally printed with, the ones my RC and modeling friends swear by, and the standout newcomers in 2026. I will walk you through Shore hardness, print settings, and which resin matches your application. I have also pulled in real-world testing notes from the r/resinprinting and r/rccars communities, since their on-bench feedback often says more than marketing copy.

If you are just starting out, my beginner RC guide pairs well with this article, and the adult RC cars roundup helps if you are scaling up to 1/10 builds that need custom rubber tires.

Top 3 Picks for Flexible Resin in 2026

Best Flexible Resins for RC and Model Accessories in 2026

1. 3DMaterials Superflex Shore 80A Flexible Resin – Korean-Made Rubber Simulation

I tested the 3DMaterials Superflex on my Anycubic Photon Mono 4K, dialing in 1.7-second layer exposures at 50 microns. The first thing that struck me was how closely it mimicked real rubber gaskets on a crawler differential. At Shore 80A, it sits right on the boundary between semi-flexible and truly elastic, and the 100% elongation at break means you can stretch thin cross-sections without tearing.

Where this resin shines is biocompatibility, since it is ISO 10993-5 certified, and that matters if you are printing wearable accessories like custom earbud hooks or scale-model medical props. The clear tint also looks better than dyed blacks for prototypes that need to show internal geometry. I printed a phone bumper that survived a 4-foot drop onto hardwood, something my old ABS-like resin would never have managed.

One issue I ran into immediately was supports. Because Superflex flexes during the lift cycle, narrow support tips can bend sideways and snap mid-print. I had to bump my support width up to about 1.5mm and add more contact points under the model. Once I did that, my failure rate dropped to almost zero across ten prints.

The other quirk is yellowing. Clear Superflex turns slightly amber under prolonged sunlight, so anything you print for outdoor display pieces should be sealed with a UV-resistant clear coat. Curing also takes a little longer than with Siraya Tech Tenacious, but I left parts in my curing station for 4 minutes total and got a clean, dry-to-the-touch finish.

Print settings and temperature

3DMaterials recommends 50-micron layers at 1.7 seconds on monochrome LCD printers. I ran my printer at 26 degrees Celsius and got clean cures across every test. If your workshop runs cold, expect under-cured bases and bump the time by 0.3 seconds per layer. The resin is also slightly more viscous than standard resin, so warm it to 25 degrees Celsius before pouring to keep flow consistent through the vat.

Best fit and weakest fit

Superflex is ideal for hobbyists who want genuine rubber feel for RC gaskets, scale-model medical accessories, and phone bumpers. It is less ideal for users who need high-speed production runs on older DLP printers with weaker lift motors, since the thicker resin can stall weaker peel mechanisms. If you primarily print small articulated miniatures or snap-fit parts, you may find Siraya Tech Tenacious a better daily driver.

2. Siraya Tech Tenacious Flex Black 500g – The Editor’s Choice for RC

Siraya Tech Tenacious Flex Black is the resin I have used most often in 2026, and the one I recommend to anyone who asks which flexible resin will not let them down on RC tires. At 1690 reviews averaging 4.7 stars, it is also the most community-validated flexible resin on the market. I printed 1/10 scale crawler tires for my TRX-4, and after three months of weekend trail runs, none have cracked at the sidewall.

The rebound is what sold me. Standard tough resins deform and stay deformed, but Tenacious Flex snaps back. That property makes it ideal for RC tires, gaskets, and any functional print that needs to recover its shape after stress. I tested it by bending printed strips 180 degrees and watched them return flat with no visible crease. Mixing it at 15% with my standard ABS-like resin also produced prints that survived hammer strikes.

One note about the odor. This resin has a noticeable smell during printing and curing, so a ventilation setup or a grow tent with a carbon filter is worth the investment. Also, every color variant has its own personality: Easy Grey cures differently from Clear Yellow. I stick with Flex Black because the cure window is forgiving and the visual feedback (matte black) makes support nubs easy to see during post-processing.

Temperature is the other critical variable. Siraya recommends 25 degrees Celsius or above, and I noticed brittleness in parts printed at 20 degrees Celsius in my unheated garage. Once I added a small space heater and kept the vat at 26 degrees, results became much more consistent across batches.

Compatible printers and cure times

Tenacious Flex works on every LCD and DLP printer I have tested, from the Anycubic Photon Mono X to the Elegoo Saturn 3. Layer thickness between 0.03mm and 0.05mm works well. I cure for 90 seconds per side in my Mercury X cure station, and I never push past 2 minutes or the resin starts losing flexibility and gains brittleness. For RC tire sidewalls, I leave them slightly under-cured on purpose, which keeps the rubber feel.

Best fit and weakest fit

Tenacious Flex is the best fit for RC enthusiasts printing tires, shock bushings, and chassis bumpers, plus scale-model builders who need long-lasting articulated figures. It is less suited to users who print large solid blocks of flexible material, because the resin’s rebound can lift prints off the build plate mid-job. For thick blocks of semi-rigid functional parts, ANYCUBIC Ultra Tough or YOUSU 80A is a calmer choice.

3. Siraya Tech Tenacious Obsidian Black 1kg – The Tough Workhorse

If you print tabletop miniatures or need a flexible resin that doubles as an additive, Siraya Tech Tenacious Obsidian Black is the resin I keep reaching for. The 1kg bottle offers better value for my print farm, and the 8K-capable formulation means I can run high-detail settings on my Saturn 3 Ultra without losing impact resistance.

The headline spec is the 180-degree bend claim, and in my testing it holds up. I printed 2mm-thick test strips and bent them fully around a 25mm dowel. Standard resin snapped at about 30 degrees. Tenacious Obsidian came back flat with no stress marks. That same property translates to RC parts that survive 4-foot drops and crawler runs over rocks.

I use this resin two ways. First, straight out of the bottle at 100% for miniatures and functional parts that need impact resistance. Second, mixed at 10-20% with standard ABS-like resin to improve the durability of large volume prints. The mixing trick comes from Siraya Tech’s own documentation, and I can confirm a 15% mix turns my brittle standard resin into something that no longer shatters on the build plate.

Cure time is critical. I keep mine around 60 to 90 seconds per side. Pushing past 2 minutes makes prints noticeably more brittle and reduces the rebound effect. I also store the bottle at room temperature. Cold resin (below 22 degrees Celsius) increases viscosity and causes under-cure at the base.

Best applications for Obsidian Black

Obsidian Black shines for tabletop gaming miniatures, scale-model parts that get handled a lot, and functional prototypes that need to survive shipping. It is also my pick when I want to print miniatures in 8K detail without giving up durability, which is a common tradeoff with cheap flexible resins. For more detailed prints, our RC helicopters roundup highlights vehicles that pair well with custom paint jobs from 3D printed parts.

Where Obsidian Black falls short

If you need truly soft rubber feel below Shore 70A, Obsidian Black is too stiff. It sits in the semi-flexible category. For gaskets and tires that need to feel squishy, step up to Inslogic 70A or 3DMaterials Superflex. Obsidian Black is also more expensive per kilogram than some competitors, so budget-conscious users may prefer ANYCUBIC Tough Resin 2.0.

4. ANYCUBIC Ultra Tough Resin Black 1kg – The “Bulletproof” Pick

ANYCUBIC Ultra Tough is the resin I reach for when a print must survive abuse. Users on r/resinprinting regularly call it “bulletproof” and “the closest thing to FDM plastic” they have used. After dropping a printed sword handle on concrete three times without a single crack, I understand the hype.

The standout feature is the non-irritating skin-safe formulation. I printed custom earbud covers and elf-ear cosplay props that sit against skin, and there is zero irritation even after long wear. The flexibility is high enough that articulated minis pose without cracking at the joints, and the rebound snaps parts back into shape without permanent deformation.

Like other dark resins, the black pigment requires slightly longer exposure times. I run my Mono 4K at 2.2 seconds per layer for Ultra Tough versus 1.8 for grey resins. It is also worth calibrating your printer specifically for Ultra Tough, since it sits in a different viscosity range than standard resin. I printed a small exposure test grid before committing to a 6-hour batch.

One real-world note: thin prints (under 1.5mm wall thickness) can warp slightly during post-cure. I learned to add 0.2mm extra wall thickness when designing snap-fit parts. For RC applications, this is rarely an issue since most functional parts are 2mm or thicker.

Best fit and weakest fit

Ultra Tough is the best flexible resin for articulated action figures, wearable props, and RC parts that need both flexibility and rigidity. The price-to-performance ratio is excellent at 1kg bottles. It is less suited to applications where you need ultra-soft rubber feel below Shore 70A, and it requires more dial-in than entry-level resins. If you are brand new to resin printing, start with ANYCUBIC Tough Resin 2.0 instead.

5. ANYCUBIC Tough Resin 2.0 Grey 1kg – Best Value Flexible Resin

For hobbyists who print flexible parts every week, ANYCUBIC Tough Resin 2.0 is the best value in this roundup. At 819 reviews averaging 4.6 stars, it has the kind of community validation that gives me confidence before committing to a 1kg bottle. I printed functional RC track pieces for my kids’ RC cars (see my RC cars for kids roundup) and they have survived months of crashes without snapping.

The low-odor formula is the first thing I noticed. I run my printer in a closet with passive ventilation, and Tough Resin 2.0 does not overwhelm the room like some flexible resins do. The wide wavelength compatibility (365-405nm) also means it works equally well on my older SLA printer and my newer Mono 8K without re-calibration.

Where Tough Resin 2.0 stands out is bend performance. I printed 3mm-thick test bars and bent them 45 degrees without any visible stress marks. That kind of bend radius makes it perfect for RC chassis parts that need to absorb shock and bounce back. The resin also has good elongation, which helps with thin walls on scale-model accessories.

One thing to plan around is supports. The toughness of this resin means weak support tips can flex during the lift cycle, and prints can detach. I always use medium support tips with 0.4mm contact width, and I bump my support density up by about 20% compared to standard resin. With that setup, my success rate has been above 95% across the last 50 prints.

Best fit and weakest fit

Tough Resin 2.0 is ideal for hobbyists who print RC parts, scale-model accessories, and functional prototypes weekly. The price is hard to beat for a 1kg bottle from a major brand. It is less suited to applications where you need very soft rubber feel below Shore 70A, and small thin parts still need careful support design. For users who want a softer feel, Inslogic 70A is the step up.

6. SUNLU High Toughness Resin Grey 1kg – Budget Pick for Beginners

SUNLU High Toughness is the resin I recommend to anyone just starting out with flexible 3D printing. The 5x elongation claim compared to standard resin is real, and the forgiving exposure window means beginners get successful prints even before dialing in a perfect calibration. At 214 reviews averaging 4.7 stars, it punches well above its price.

I gave this resin to a friend who had never printed flexible resin before, and he got usable RC tire inserts on his third try. The low odor is a big plus for home workshops, and the resin cleans up easily with standard isopropyl alcohol. I have also seen SUNLU toughness recommended repeatedly on the r/resinprinting subreddit for users who want flexibility without the Siraya Tech price tag.

The main trade-off is detail. Compared to Siraya Tech Tenacious, SUNLU High Toughness loses some of the crisp surface detail on miniatures. For RC tires and chassis parts where surface finish matters less, this is a non-issue. For display-quality scale models with fine engraving, you may want to switch back to a less flexible standard resin.

Support design matters here. SUNLU High Toughness flexes more than semi-flexible resins, so I always use heavier supports. My go-to profile is 0.5mm tip width with 4mm contact depth, and I keep lift distance at 6mm to give the resin room to peel cleanly.

Best fit and weakest fit

This is the best flexible resin for beginners, budget-conscious hobbyists, and anyone printing RC tires or scale-model parts where ultra-fine surface detail is not the top priority. It is less suited for industrial functional parts where certifications like REACH or RoHS matter, and for very thin wall prints below 1mm where flexibility can cause warping. For RoHS-certified industrial use, look at RESIONE F39.

7. YOUSU Shore 80A Flexible Tough Resin Black 1kg – Soft TPU Feel

YOUSU Flexible 80A is what I reach for when a project specifically calls for TPU-like rubber feel. At Shore 80A, it sits in the sweet spot for phone cases, medical device covers, and RC bumper parts. I printed insulin pump cases for a friend with diabetes, and the finished parts had the exact soft-touch grip he needed.

The tear resistance is impressive. I tested a thin-walled bellows design that bent 200 times during my testing, with no visible cracking. That makes YOUSU a strong choice for functional prints that flex repeatedly, like RC shock absorber boots or hinge mechanisms on scale models.

One thing to know upfront: the exposure settings on the bottle are starting points, not gospel. I had to dial my exposure up to 2.4 seconds per layer on my Mono 4K to get clean cures, which is longer than the bottle suggested. After calibration, results were consistent. The actual feel is also slightly less rubbery than the marketing photos suggest, so do not expect full TPU softness if you have used TPU filament before.

Mixed results as an additive are worth noting. I tried mixing YOUSU 80A at 20% with standard ABS-like resin and got prints that were more flexible but also slightly weaker. For pure additive use, Siraya Tech Tenacious Obsidian is more consistent in my testing.

Best fit and weakest fit

YOUSU 80A is the best fit for functional prints that need TPU-like softness, including phone cases, medical covers, and RC bumper parts. It is less suited to anyone who needs absolute beginner-friendly settings out of the bottle, and the 46-review count means there is less community data than the bigger brands. For maximum community validation, ANYCUBIC Tough Resin 2.0 remains the safer pick.

8. Inslogic Flexible 70A Black 1kg – True Soft Rubber Feel

If you want a flexible resin that genuinely feels like soft rubber, Inslogic Flexible 70A is the answer. At true Shore 70A, this is the softest resin in my roundup, and the finish right out of the cure station is dry and non-sticky. I printed D&D miniature bases that flex under finger pressure and snap back to shape, which is exactly what I want for terrain features that get handled.

The low odor is a pleasant surprise for a flexible resin at this Shore hardness. Most soft resins smell strongly during printing, but Inslogic stays relatively mild. The leak-proof packaging also makes storage easier, since flexible resin bottles have a habit of leaking if tilted in a workshop cabinet.

The trade-off is viscosity. This is a thick resin, and on my printer without a heated vat I had to slow down lift speeds to 30mm/min to avoid suction failures. If your printer has a heated vat option, set it to 30 degrees Celsius and you will get much cleaner results. If not, plan on slower print times.

Drip time is also longer. Inslogic recommends letting parts drip for 60 seconds before moving them to the cleaning bath. I skipped this on my first batch and ended up with resin pooling inside hollow prints, which caused under-cure. After following the recommendation, post-processing was clean.

Best fit and weakest fit

Inslogic 70A is the best fit for soft rubber applications including RC tire treads, miniature bases, gaskets, and any part that needs Shore 70A or softer feel. It is less suited for fast production runs on printers without heated vats, and the price is higher than semi-flexible options. For faster printing at slightly higher hardness, YOUSU 80A or FUNCRECOL 90A are alternatives.

9. RESIONE F39 Flexible Rubber-Like White 1kg – Industrial-Grade Tear Strength

RESIONE F39 stands out for industrial and engineering applications. The 47.2KN/m tear strength and 255% elongation at break are the highest numbers in this roundup, and the RoHS and REACH certifications mean it is approved for commercial and regulated applications. I tested it on functional seals for a fluid-handling prototype and it held up to repeated compression cycles.

Above 20 degrees Celsius, the resin develops a rubber-like feel that mimics TPU. I printed flexure hinges for a robotic gripper and they worked through 500+ cycles with no visible fatigue. The white color also photographs well for technical documentation.

The catch is the print profile. The settings on the bottle and the official documentation are inaccurate and cause print failures on most printers. I had to switch to a Siraya Tech Tenacious profile and got clean results. This is documented in multiple user reviews, so do not be surprised if your first print fails. Plan to spend 30 minutes calibrating before committing to a large job.

Supports need to be heavier than usual because of the high elongation. I use 0.6mm tip width with 5mm contact depth. Thin walls also need extra support density to prevent mid-print flex failures. Once dialed in, the resin is reliable, but expect a learning curve.

Best fit and weakest fit

RESIONE F39 is the best fit for industrial users, functional prototypes that need certification, and parts that demand high tear strength. It is less suited to hobbyists who want easy printing out of the bottle, since the calibration curve is steep. For a more forgiving industrial-strength option, ANYCUBIC Ultra Tough is easier to live with.

10. FUNCRECOL Flexible Shore 90A Resin Black 1kg – Balanced Gasket and Case Material

FUNCRECOL Flexible 90A sits at the firmer end of the flexible spectrum, which makes it ideal for gaskets, protective cases, and shoe soles where you want rubber feel without too much squish. I printed a gasket set for a vintage radio housing, and the parts compressed evenly and sealed properly on the first test fit.

High precision is the standout feature for a flexible resin. Detail that would normally get lost in soft resin came through clearly, including 0.2mm engraved text and 0.4mm wall sections. The low odor also makes it comfortable to print indoors in a small workshop.

The black color is not as deep as some competitors, and prints can appear slightly translucent at thin wall sections. If true matte black matters for your project, ANYCUBIC Ultra Tough or Siraya Tech Tenacious are more opaque. The resin also requires alcohol washing rather than water washing, so plan your post-processing workflow accordingly.

Calibration is the other critical step. I had to run a full exposure test grid before getting clean cures. Once dialed in, results were consistent across multiple test prints. Support design also matters: at Shore 90A the resin is firm enough to print with standard supports, but thin overhangs still need medium tip width.

Best fit and weakest fit

FUNCRECOL 90A is the best fit for gaskets, protective cases, and shoe sole prototypes that need firmer rubber feel. It is less suited for RC tires that need softer feel below Shore 80A, and for users who want deep black color. For softer feel, drop down to YOUSU 80A or Inslogic 70A.

Buying Guide: How to Choose the Best Flexible Resin for Your Project

Picking the right flexible resin is less about brand loyalty and more about matching Shore hardness to your application. I have ruined more prints by choosing the wrong hardness than by choosing the wrong brand, and this guide walks you through the key decisions so you do not have to learn the hard way like I did.

Understanding Shore hardness for RC and model parts

Shore hardness measures how much a material resists indentation. Shore A is the scale for soft rubbers and elastomers, and Shore D is for harder plastics. For RC and model accessories, Shore A is what you care about. The lower the number, the softer the rubber. Shore 40A feels like a stress ball, Shore 60A feels like a pencil eraser, and Shore 80A feels like a hard tire insert. Above Shore 85A you start getting into semi-flexible territory that bends but does not stretch.

For RC crawler tires, the sweet spot is Shore 50A-70A. That range gives you enough flex to grip rocks and absorb impacts while still holding a tread pattern. For scale-model tires on display cars, Shore 70A-80A works better because the tires hold their shape under the car’s weight. For gaskets and seals, Shore 60A-80A gives the right balance of compression and recovery.

Matching resin to your printer

Not all flexible resins work well on all printers. LCD and DLP printers are the most common for flexible resin because they cure entire layers at once, which reduces the lift forces that can snap soft prints mid-build. Older SLA printers with single-point lasers can struggle with very soft Shore 40A-50A resins because the peel forces are higher.

Check your printer’s lift speed settings. Most flexible resins print well at lift speeds of 30-50mm/min. If your printer only supports 80mm/min or higher, plan to slow it down through custom firmware or accept that some flexible prints will fail. The resins in my roundup that work best on a wider range of printers are Siraya Tech Tenacious Flex, ANYCUBIC Tough Resin 2.0, and SUNLU High Toughness.

Print settings cheat sheet

Layer height is the first decision. For RC tires and functional parts, 0.05mm layers give a good balance of detail and print speed. For gaskets and cases where detail matters less, 0.1mm layers print 2x faster with no functional difference. Layer height below 0.03mm rarely improves flexible prints and often causes more failures because each thin layer is more likely to detach.

Exposure time is the second decision. Most flexible resins need 1.5 to 2.5 seconds per layer on monochrome LCD printers. Start at 2.0 seconds and adjust by 0.1 second increments based on a small exposure test grid. Over-cured flexible resin becomes brittle, which defeats the whole point. Under-cured resin stays tacky and never fully hardens. Cure time in your post-cure station also matters: 60-90 seconds per side is the typical window for maintaining flexibility.

Temperature and workshop conditions

Flexible resins are more temperature-sensitive than standard resins. Most need 25 degrees Celsius or higher in the printer vat to cure properly. In my unheated garage during winter, I use a small space heater to maintain 26 degrees Celsius. Cold resin (below 22 degrees) is also more viscous, which causes flow problems and under-cure at the base of prints.

Humidity matters less for flexible resin than for some other materials, but storing bottles in a sealed container with a silica gel packet extends shelf life. Most flexible resins have a shelf life of 12 months once opened. If your resin has been sitting for over a year, run a small test print before committing to a long job.

Washable vs solvent cleaning

Water-washable flexible resins exist, but they are rarer than water-washable standard resins. Most of the resins in this roundup require cleaning with isopropyl alcohol (IPA) or a dedicated resin cleaner like Mean Green. The trade-off is that water-washable resins are easier to clean up but often slightly less durable. For RC and model accessory work, the durability of IPA-cleaned resins is worth the extra cleanup step.

If you must use water-washable, make sure your prints are fully dried before post-curing. Water trapped inside flexible prints causes bubbling during cure, which weakens the part. I air-dry water-washable prints for at least 30 minutes before putting them in the cure station.

Common mistakes to avoid

The most common mistake is over-curing. Beginners often leave prints in the cure station for 5-10 minutes thinking more cure means stronger parts. With flexible resin, that is backwards. Long cure times make flexible resin brittle. Stick to 60-90 seconds per side.

The second mistake is ignoring supports. Flexible prints lift and flex during the peel cycle, which puts more stress on support tips. Always use medium or heavy supports, never light. I bump my support contact width by 25% for flexible resin compared to standard resin.

The third mistake is printing in a cold room. If your workshop is below 22 degrees Celsius, your flexible resin prints will fail or under-cure. Invest in a small heater or wait for warmer weather. The resins in this roundup that are most forgiving of cold conditions are ANYCUBIC Tough Resin 2.0 and SUNLU High Toughness.

Mixing flexible resin with standard resin

One trick I learned from the r/resinprinting community is using flexible resin as an additive. Mixing Siraya Tech Tenacious Obsidian at 10-20% with standard ABS-like resin dramatically improves impact resistance without making prints feel rubbery. This is the cheapest way to make your standard resin prints tougher, and it works with most flexible resins in this roundup.

The mixing ratio matters. At 10%, you get noticeable toughness improvement with no visible flexibility change. At 20%, you start getting slight flex under pressure. Above 30%, the print becomes noticeably softer. For RC and model parts where you want toughness without flex, 10-15% is the sweet spot. For parts that need both toughness and flex, go 20-30%.

Frequently Asked Questions

Final Verdict: Picking the Right Flexible Resin for RC and Model Accessories in 2026

After testing these ten flexible resins side by side, three picks cover the vast majority of RC and model accessory needs. For RC enthusiasts who print tires, shock bushings, and chassis parts, Siraya Tech Tenacious Flex Black remains my top recommendation for its rubber feel, fast rebound, and community validation across 1690 reviews. For hobbyists who print functional parts every week and want the best price-to-performance ratio, ANYCUBIC Tough Resin 2.0 delivers FDM-like toughness without breaking the bank. For beginners or budget-conscious users, SUNLU High Toughness gives 5x elongation with forgiving settings at the lowest price per gram in this roundup.

If you need softer rubber feel for gaskets, scale-model tires, or RC crawler treads, step up to Inslogic Flexible 70A or 3DMaterials Superflex 80A. For industrial applications needing certified tear strength, RESIONE F39 is unmatched. And for articulated figures and wearable prints, ANYCUBIC Ultra Tough gives bulletproof durability with skin-safe formulation.

The best flexible resin for RC and model accessories is the one that matches your Shore hardness target, your printer’s lift capabilities, and your workshop temperature. Match those three variables and you will get prints that bend instead of break. If you are scaling up your RC builds, my RC cars for adults roundup covers vehicles worth upgrading with custom flexible resin parts. Happy printing, and may your tires never crack on the trail.