Bed Adhesion Tricks for PETG and TPU: A Guide for Makers and RC Pilots

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Introduction

Getting good bed adhesion is key to successful 3D prints, especially when working with flexible or tricky filaments like PETG and TPU. For hobby RC pilots and makers in the UK, mastering these materials opens up new possibilities for custom parts and durable prototypes. This guide covers simple but effective tricks to help your first layer stick perfectly every time.

Why PETG and TPU Need Special Attention

PETG (Polyethylene Terephthalate Glycol) and TPU (Thermoplastic Polyurethane) are popular for their strength and flexibility. However, their unique properties can make them a bit challenging to print compared to PLA or ABS.

  • PETG tends to be stringy and can stick too well to some surfaces, sometimes pulling off the build plate when removed.
  • TPU is very flexible and soft, which can cause issues with bed adhesion and extrusion consistency.

Bed Adhesion Tips for PETG

1. Clean the Bed Thoroughly

Make sure your print bed is free of grease and dust. Use isopropyl alcohol (IPA) to wipe down the surface before printing. A clean bed ensures better adhesion.

2. Use a Suitable Build Surface

Glass beds, PEI sheets, or BuildTak surfaces work well with PETG. However, avoid applying glue sticks or hairspray as PETG can bond too strongly and damage your bed.

3. Set the Right Bed Temperature

Set your heated bed to around 70-80°C. This warmth encourages the PETG to stick without warping.

4. Adjust First Layer Settings

Print the first layer slower (around 20-25 mm/s) and slightly thicker (0.2-0.3 mm) to improve adhesion. Also, a first layer height slightly higher than usual helps the filament lay down smoothly.

Bed Adhesion Tips for TPU

1. Use a Flexible Build Surface

TPU prints benefit from flexible surfaces like PEI or textured spring steel sheets. These allow easy removal without damaging the print.

2. Lower the Bed Temperature

Set the bed temperature to around 40-60°C. TPU doesn’t require as much heat to stick, and higher temperatures can cause excessive softening.

3. Apply a Light Adhesive Layer

Consider using a glue stick or a thin layer of PVA-based adhesive on the bed. This creates just enough tackiness for TPU to hold without sticking too aggressively.

4. Calibrate Retraction Settings

Because TPU is flexible, too aggressive retraction can cause jams or poor extrusion. Optimize retraction distance and speed to improve flow and adhesion.

General Tips for Both Materials

  • Level Your Bed Precisely: A well-leveled bed ensures the nozzle lays down filament evenly, crucial for adhesion.
  • Use a Brim or Raft: Adding a brim or raft can increase surface contact for better stickiness.
  • Print in a Controlled Environment: Avoid drafts and sudden temperature changes which can cause warping or lifting.

Conclusion

With these practical tips, UK makers and RC enthusiasts can confidently print with PETG and TPU, unlocking new design opportunities. Remember, patience and small tweaks to your print settings make all the difference in achieving strong bed adhesion and high-quality prints.

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