TPU (Thermoplastic Polyurethane) occupies a unique space in the 3D printing material landscape. While PLA and PETG dominate the market for rigid collectibles and functional prints, TPU enables an entirely different category of objects — pieces that bend, compress, stretch, and bounce back to their original shape. For collectors and designers interested in articulated figures, squeeze toys, and flexible display pieces, TPU unlocks possibilities that rigid filaments simply cannot achieve.
At 3DCentral, our print farm in Laval, Quebec includes printers specifically configured for TPU production. Printing flexible filaments reliably at scale requires different hardware, different settings, and different design considerations than rigid materials. This guide covers everything you need to know about working with TPU, whether you are a hobbyist exploring flexible prints for the first time or a print farm operator adding TPU products to your catalog.
Understanding TPU: Properties and Grades
TPU is a class of thermoplastic elastomers that combine the processing ease of thermoplastics with the elastic properties of rubber. The result is a filament that can be extruded through a standard FDM hot end but produces parts with rubber-like flexibility.
Shore Hardness Scale
TPU flexibility is measured on the Shore A hardness scale. Understanding where different grades fall helps you select the right material for your application.
Shore 85A TPU is very soft and flexible — comparable to a rubber band or pencil eraser. It compresses easily and stretches significantly before returning to shape. Printing 85A reliably requires specialized equipment and slow speeds.
Shore 95A TPU is the standard for most 3D printing applications. It is firm enough to hold shape and maintain printed geometry but flexible enough to bend freely and absorb impacts without cracking. Most commercially available TPU filament is 95A.
Shore 98A TPU sits at the boundary between flexible and semi-rigid. It bends under force but feels substantially stiffer than 95A. Good for applications that need slight flex without being truly rubbery.
Mechanical Properties
TPU’s elongation at break exceeds 400 percent for most grades, meaning it can stretch to four times its original length before failing. This makes TPU prints nearly indestructible under normal handling conditions. Drops, squeezes, bends, and twists that would shatter PLA or crack PETG leave TPU completely unaffected.
Impact resistance is exceptional. TPU absorbs energy through deformation rather than cracking. A TPU figurine dropped from a table bounces rather than shattering — a property that makes TPU ideal for items that will be handled frequently.
Applications in Collectibles and Decorative Objects
Articulated Figures
Print-in-place articulated figures are among the most popular applications for flexible filament. Designs from artists like Flexi Factory use TPU’s flexibility to create joints that move smoothly without the clearance requirements that rigid materials demand. A dragon printed in 95A TPU bends and poses freely, with joints that flex rather than click into position.
The figurines collection at 3DCentral includes several articulated designs that benefit from TPU’s unique properties. Flexible joints last longer than rigid ones because they distribute stress across the entire bend radius rather than concentrating it at a single pivot point.
Squeeze Toys and Tactile Collectibles
Rubber ducks, squishy gnomes, and compression-style fidget toys gain an entirely different character when printed in TPU. Unlike rigid PLA versions that are purely visual display pieces, TPU versions invite physical interaction. Squeeze them, bend them, bounce them — they always return to their original form.
This tactile quality creates a distinct value proposition. A PLA duck sits on a shelf. A TPU duck sits on a desk and gets squeezed during phone calls. The functional interaction increases the emotional connection with the collectible and makes it a more compelling purchase for certain buyer segments.
Multi-Material Assemblies
Advanced designs combine rigid PLA components with flexible TPU elements. A figurine might have a rigid PLA body with TPU arms that flex and pose. A desk organizer might use rigid walls with a TPU grip surface. These hybrid approaches leverage the strengths of each material where they matter most.
Printing TPU: Hardware Requirements
Extruder Type: Direct Drive Is Essential
The single most important hardware requirement for reliable TPU printing is a direct-drive extruder. In a direct-drive setup, the motor that pushes filament sits directly on the print head, minimizing the distance between the drive gear and the hot end.
Bowden tube setups — where the motor sits on the frame and pushes filament through a long tube to the hot end — struggle with TPU because the flexible filament compresses and buckles inside the tube rather than feeding smoothly. The longer the Bowden tube, the worse the problem. While some operators have found workaround settings for stiff 98A TPU on Bowden setups, reliable results with 95A and softer grades require direct drive.
Hot End Temperature
TPU prints at 210 to 230 degrees Celsius for most brands. Start at 220 and adjust based on adhesion and stringing behavior. Too cool produces weak layer bonding. Too hot causes excessive stringing and oozing that is difficult to remove from flexible parts.
Bed Temperature and Surface
A bed temperature of 40 to 60 degrees Celsius works for most TPU formulations. TPU adheres well to most surfaces, including PEI, glass with glue stick, and BuildTak-style surfaces. In fact, TPU sometimes adheres too well — allow the bed to cool fully before removal to prevent surface damage.
Print Settings for TPU
Speed: Slow and Steady
Print speed is the critical parameter for TPU quality. Standard recommendations fall between 20 and 35 millimeters per second — roughly half to one-third the speed used for PLA. At these speeds, the flexible filament feeds consistently without buckling or compressing in the drive path.
Travel speed should also be reduced to 100 to 150 millimeters per second. Rapid travel moves create sudden tension changes that can cause flexible filament to tangle or pop out of the feed path.
Retraction: Minimal or Disabled
Retraction is the most challenging setting for TPU printing. Flexible filament does not retract cleanly because it compresses and stretches rather than pulling back as a rigid column. Start with retraction disabled and accept some stringing. If stringing is excessive, enable retraction at 1 to 2 millimeters distance and 25 millimeters per second speed — roughly half the retraction settings used for PLA.
For prints where surface quality is critical, plan for post-processing. Minor TPU stringing is easily removed with a heat gun on low setting or by careful trimming with small scissors.
Cooling and Layer Settings
Enable the cooling fan at 50 to 75 percent for TPU — less than the 100 percent typically used for PLA. TPU needs slightly longer to bond between layers due to its elastomeric nature.
Layer height of 0.2 millimeters provides a good balance of speed and quality for most TPU prints. Thicker layers (0.28 to 0.32) work for large, less detailed objects. Thinner layers (0.12 to 0.16) improve detail on small figurines but dramatically increase print time.
TPU Compared to Other Flexible Materials
TPE (Thermoplastic Elastomer)
TPE is the broader category that includes TPU. Non-TPU variants of TPE tend to be softer and more rubber-like but significantly harder to print. They buckle more easily in the feed path and require even slower speeds. For most applications, TPU provides comparable flexibility with far better printability.
Flexible PLA
Some manufacturers offer PLA blends marketed as flexible. These are technically semi-flexible — they bend slightly under force but do not compress or stretch like true TPU. They print at standard PLA settings, which is convenient, but the flexibility is limited and they crack under repeated bending.
For operators interested in producing flexible collectibles commercially, our Commercial License program includes access to models optimized for both rigid and flexible materials, with documented print settings for each.
Browse the full range of collectibles — rigid and flexible — in our shop.
Frequently Asked Questions
Q: Can any 3D printer print TPU flexible filament? A: While technically any FDM printer can attempt TPU, reliable results require a direct-drive extruder. Bowden tube printers struggle with flexible filament because the material compresses and buckles inside the tube. If your printer has a Bowden setup, consider upgrading to a direct-drive conversion kit or limiting attempts to stiffer 98A TPU at very slow speeds.
Q: Why are my TPU prints so stringy? A: Stringing is the most common TPU printing issue because retraction — the primary anti-stringing mechanism — works poorly with flexible materials. Reduce your hot end temperature by 5 to 10 degrees, minimize retraction to 1 to 2 millimeters, and accept that minor stringing may require post-processing with a heat gun. Ensuring your filament is dry also reduces stringing significantly.
Q: How durable are TPU 3D prints compared to PLA? A: TPU prints are dramatically more durable under physical stress. Where a PLA figurine might crack or shatter from a desk-height fall, a TPU version bounces without any damage. TPU resists cracking, splitting, and fatigue from repeated bending. For display pieces that will be handled, squeezed, or dropped, TPU is the superior material for longevity.
