Bed Adhesion Tricks for PETG and TPU: A Maker’s Guide

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Introduction

If you’re a hobby RC pilot or maker using PETG or TPU filament, you know how tricky bed adhesion can be. These materials offer great flexibility and strength, perfect for durable parts and flexible components, but they also present unique challenges when it comes to sticking to your print bed. In this guide, we’ll explore simple, effective tricks to improve adhesion and get your prints started on the right foot.

Understanding PETG and TPU

PETG (Polyethylene Terephthalate Glycol) is a popular filament known for toughness, chemical resistance, and ease of printing compared to ABS. It’s less prone to warping but can stick too well to certain surfaces, sometimes damaging your print bed.

TPU (Thermoplastic Polyurethane) is a flexible filament, ideal for parts that need to bend or absorb impacts. TPU’s flexibility makes adhesion harder because the filament doesn’t hold shape as rigidly when first deposited.

Common Bed Adhesion Challenges

Because of their different properties, PETG and TPU require different approaches for good bed adhesion:

  • PETG: Can bond too aggressively to glass or PEI sheets, risking damage.
  • TPU: May not stick well initially due to its flexibility and slower solidification.

Bed Adhesion Tricks for PETG

1. Use a Suitable Bed Surface

For PETG, a glass bed or PEI sheet is popular. However, to prevent overly strong adhesion, apply a thin layer of glue stick or hairspray. This acts as a barrier and makes part removal easier.

2. Adjust Bed Temperature

Set your bed temperature between 70°C and 80°C. This is warm enough to help the filament bond but cool enough to avoid excessive sticking.

3. Calibrate the First Layer

Ensure your nozzle is not too close to the bed. A perfect first layer is slightly squished but not overly flattened. This prevents the filament from fusing too tightly with the bed.

Bed Adhesion Tricks for TPU

1. Use a Flexible Surface

A PEI sheet or BuildTak surface works well for TPU. These surfaces provide enough grip for flexible filament without damaging the print.

2. Lower Bed Temperature

TPU generally prints well with a bed temperature between 40°C and 60°C. Too hot, and it can become too soft and fail to hold shape.

3. Slow Down the First Layer

Reducing the first layer speed to around 15-20 mm/s gives TPU time to properly adhere and form a solid base.

4. Use a Brim or Raft

Adding a brim or raft can increase surface contact, helping flexible TPU parts stick better during printing.

General Tips for Both Materials

  • Clean your print bed regularly with isopropyl alcohol to remove oils and dust.
  • Consider using a thin layer of blue painter’s tape for PETG if you don’t want to use glue sticks.
  • Make sure your environment is draft-free to avoid rapid cooling and warping.
  • Test small calibration prints to dial in your settings before larger prints.

Conclusion

Mastering bed adhesion for PETG and TPU takes some practice, but with the right surface, temperature, and print settings, you’ll get consistent, high-quality prints. Whether you’re making durable RC parts or flexible components, these tips will help your creations stick—and stay stuck—just right.

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