Start with the exact TPU grade and printer
TPU stands for thermoplastic polyurethane. Different grades can vary in hardness and handling, so start with the full product name and manufacturer guidance. A familiar 95A label is not a complete printer profile or a guarantee of compatibility.
Decide what the object should do: bend, compress, grip or recover its shape. Wall thickness and internal geometry affect the result as well as the material. A thin lattice and a solid block from the same spool will not feel identical.
Check the extruder and filament feed path
Flexible material can bend in unsupported gaps instead of advancing as intended. Check your printer's loading procedure, extruder guidance and feeder restrictions. A direct-drive arrangement may help, but it does not replace a product-specific compatibility check.
Automatic material systems need separate attention. Bambu Lab's A1 guide, for example, distinguishes TPU printer support from AMS lite restrictions and directs flexible material to external spool placement. Follow the exact guidance for your system rather than assuming support transfers from the printer to its accessories.
If loading becomes difficult, stop and inspect according to the printer's maintenance instructions. Forcing soft filament through an unsuitable path can create more work. Check spool movement and friction before changing several slicer settings.
Dry and store TPU using the manufacturer's instructions
Prusa identifies flexible materials as hygroscopic and notes the importance of keeping them dry. Use the drying procedure specified for the exact spool, with suitable equipment. Do not use an arbitrary temperature from another polymer or assume every TPU grade has the same requirements.
Keep the material protected as recommended during storage and printing. Record its handling history when comparing results. Moisture is one possible cause of inconsistent quality, but a dry spool will not fix an unsuitable extrusion path or an incorrect profile.
Set TPU print speed, temperature and retraction
Begin with a profile matched to the printer and filament. Flexible materials often require a different approach from rigid PLA, and products marketed for high-speed printing still need compatible hardware and settings. Use the maker's recommended nozzle and bed temperatures as the starting point.
Change one variable at a time. If strings appear between separate features, investigate travel, retraction, temperature and storage history methodically. Do not apply extreme retraction simply because it helped a different material. Keep the printer's guidance for flexible filament in view.
Compare speed changes on the same model and inspect both appearance and extrusion consistency. Maximum advertised printer speed is not a promise of quality for every TPU part. Save the settings that produce an acceptable result on your actual setup.
Design supports and flexible features deliberately
Plan orientation and overhangs before printing. Prusa notes that supports can be difficult to remove from flexible parts. A design change or a different orientation may be more useful than adding complex support structures that cannot be removed cleanly.
Make a representative trial of a hinge, thin wall, grip or mating feature. Measure how it behaves under the relevant conditions instead of judging only the surface. A product's Shore hardness does not establish the load capacity or fatigue life of an arbitrary printed shape.
Record the result and choose the next step
Keep the filament grade, color, printer, nozzle, feed method and profile with a photo of the sample. Note what changed and why. A useful record helps distinguish a material change from a geometry or setup problem in the next iteration.
Use the TPU category to compare flexible-material selection questions, or return to PLA and PETG if the project actually needs rigidity. Our current guidance is sourced and educational; no tested TPU product recommendation has been published.