Bed Adhesion Tricks for PETG and TPU: Get Your 3D Prints Stuck (Just the Right Way!)

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Introduction

If you're into RC modelling, DIY projects, or just love tinkering with 3D printers, you know how important good bed adhesion is—especially when printing with tricky materials like PETG and TPU. These flexible and durable filaments are fantastic for making strong, impact-resistant parts, but they can be a pain to stick to the print bed properly. In this guide, we'll explore some practical tips to improve bed adhesion for PETG and TPU, helping you get cleaner, more reliable prints.

Why PETG and TPU Need Special Care

PETG (Polyethylene Terephthalate Glycol) is a popular filament known for its strength and slight flexibility. TPU (Thermoplastic Polyurethane) is even more flexible and rubber-like, which makes it perfect for parts that need to bend or absorb shocks.

Both materials can warp or lift from the bed because they cool differently and have different adhesion properties compared to PLA or ABS. Getting them to stick well from the first layer is essential to avoid failed prints and wasted material.

Bed Preparation Tips

Before printing, your print surface needs to be ready:

  • Clean the bed: Use isopropyl alcohol (IPA) or warm soapy water to remove grease, dust, and oils. A clean bed is the first step to reliable adhesion.
  • Choose the right surface: For PETG, a glass bed or PEI sheet works well. TPU often sticks nicely to PEI or flexible build plates.
  • Apply adhesion aids: A thin layer of glue stick or hairspray can help PETG stick better. For TPU, sometimes just a clean PEI sheet is enough, but if you have trouble, try a light application of glue stick.

Printer Settings That Help

Adjusting your printer can make a big difference:

  • Bed temperature: PETG usually sticks best around 70–80°C. TPU can vary but often likes 50–60°C.
  • First layer speed: Slow down the first layer to 15–20 mm/s to improve adhesion and allow the filament to properly bond with the bed.
  • First layer height and width: Increase the first layer height slightly (e.g., 0.2 mm) and set the extrusion width to 120–150% of the nozzle diameter to create a good “squish.”
  • Nozzle distance: Make sure the nozzle is close enough to the bed—not too close to block extrusion, but close enough to flatten the filament onto the surface.

Additional Tricks

Here are some extra tips to keep your prints stuck:

  • Use a brim or raft: Adding a brim increases the surface area of the first layer and helps prevent edges from lifting.
  • Enclosure: If possible, print in an enclosure to maintain stable temperatures and reduce warping.
  • Avoid excessive cooling: For PETG and TPU, keep cooling fans low or off during the first few layers to prevent premature cooling and warping.
  • Check filament quality: Moisture can affect adhesion—store your PETG and TPU in dry boxes or use filament dryers.

Conclusion

Getting PETG and TPU to stick well to your print bed might take a bit of trial and error, but with these tips, you'll reduce failed prints and enjoy making tough, flexible parts for your RC planes, drones, or other cool projects. Remember: clean bed, right temperature, slow and squished first layer, and a bit of patience go a long way!

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