Best TPU Prints: A Guide to High-Quality PrintingFrom phone cases to shoe soles, TPU (thermoplastic polyurethane) has become a popular choice for producing flexible and durable 3D prints. However, pri......

Best TPU Prints: A Guide to High-Quality Printing

From phone cases to shoe soles, TPU (thermoplastic polyurethane) has become a popular choice for producing flexible and durable 3D prints. However, printing with TPU can be tricky due to its unique properties. In this article, we will explore the best tips and tricks for getting high-quality TPU prints.

Choosing the Right TPU Filament

Before printing, it is important to choose the right TPU filament. There are various types of TPU filaments available in the market, each with its unique properties. The key factors to consider include the Shore hardness rating, print temperature, and bed adhesion. TPU filaments with higher Shore hardness ratings (around 90A) are easier to print since they are less prone to warping. On the other hand, filaments with lower Shore hardness ratings (below 80A) are more flexible and require a lower print temperature. It is also crucial to choose TPU filaments with good bed adhesion to prevent the print from detaching from the bed.

Calibrating the Printer

Calibrating the printer is crucial for getting high-quality TPU prints. In particular, bed leveling is essential to ensure proper adhesion to the bed. TPU is notorious for sticking to the nozzle, so it is important to maintain the right distance between the nozzle and the bed. Additionally, it is recommended to print the first layer slowly, at a speed of around 20-30 mm/s, to avoid any issues.

Adjusting the Printer Settings

Once the printer is properly calibrated, it is time to adjust the settings to optimize TPU printing. The key settings to adjust include the print speed, temperature, and retraction. TPU requires a slower print speed of around 30-50 mm/s for better accuracy and adhesion. The ideal temperature for printing TPU is around 220-240°C, depending on the filament. Higher temperatures can result in stringing and blobbing issues, while lower temperatures can cause layer separation. Finally, retraction settings must be adjusted to avoid any stringing issues. Typically, a retraction distance of around 3-5 mm and a speed of 30-40 mm/s are sufficient for TPU prints.

Fine-Tuning Support Settings

When printing complex models, supports are essential to prevent any overhangs or bridging. However, printing supports with TPU can be challenging due to its flexibility and softness. It is recommended to use a dense support structure with a reduced gap between the support and the model. Additionally, the support should be printed at a lower layer height to ensure better adhesion. Finally, the support should be removed carefully to avoid any damage to the model.

Post-Printing Tips

After printing, it is important to handle the TPU prints carefully to avoid any damage. TPU is flexible but also prone to tearing, so the print must be removed gently from the bed. Additionally, it is recommended to use a sharp hobby knife or scissors to remove any stringing or protrusions. Sandpaper can also be used to smooth out any imperfections.

Conclusion

Printing with TPU can be challenging but rewarding due to its flexibility and durability. By choosing the right TPU filament, calibrating the printer, adjusting the settings, and fine-tuning support settings, you can achieve high-quality TPU prints. Don't forget to handle the prints carefully post-printing to avoid any damage. With these tips and tricks, you are sure to create stunning and functional TPU prints!