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

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Introduction

Printing with PETG and TPU filaments can be a game-changer for hobby RC pilots and makers due to their strength, flexibility, and durability. However, one common challenge is getting these materials to stick well to the print bed. Poor bed adhesion can lead to warping, failed prints, and wasted time and filament. This guide offers simple, effective tricks to improve bed adhesion for PETG and TPU, ensuring your prints start strong and finish well.

Understanding PETG and TPU

PETG (Polyethylene Terephthalate Glycol) is a tough, slightly flexible filament that bridges the gap between PLA and ABS. It’s popular for parts that need durability and some flexibility.

TPU (Thermoplastic Polyurethane) is a highly flexible filament, great for parts that require rubber-like elasticity, such as tires or vibration dampeners for RC models.

Both materials have unique adhesion needs compared to PLA, so adjusting your setup is essential.

Preparing Your Print Bed

Getting the bed ready is the first step to good adhesion. Here are some key tips:

  • Use a clean bed surface: Wipe down your print bed with isopropyl alcohol to remove grease, dust, or fingerprints.
  • Choose the right bed surface: PEI sheets, glass with a glue stick, or BuildTak sheets work well for PETG. TPU often sticks well to PEI or painter’s tape.
  • Adjust bed temperature: Set the bed temperature to around 70-80°C for PETG and 40-60°C for TPU. This helps the filament stick by keeping it slightly warm during printing.

Printer Settings for Better Adhesion

Fine-tuning your printer settings can make a big difference:

  • First layer height and speed: Use a slightly thicker first layer (0.2-0.3mm) and slow down the printing speed to around 20-30mm/s. This allows the filament to lay down smoothly and stick well.
  • Adjust extrusion multiplier: Increase the extrusion flow by 5-10% for the first layer to help the filament bond better with the bed.
  • Disable part cooling fan: Turn off or reduce the part cooling fan for the first few layers to prevent premature cooling and warping.

Additional Bed Adhesion Tricks

Here are some extra tricks that makers swear by:

  • Use a glue stick or hairspray: Applying a thin layer of PVA glue stick or hairspray on the print bed can improve adhesion for PETG prints.
  • Apply a brim or raft: Adding a brim (extra perimeter lines) or raft under the model increases surface contact and can prevent edge lifting.
  • Try a light sanding: For glass beds, lightly sanding with fine-grit sandpaper creates micro-texture that helps filament grip.
  • Use painter’s tape for TPU: Blue painter’s tape provides a slightly rough surface that TPU sticks to easily.

Tips Specific to TPU

TPU’s flexibility requires a slightly different approach:

  • Slow down print speed: TPU is prone to stringing and poor adhesion if printed too fast. Keep speeds around 15-25mm/s.
  • Ensure proper filament path: TPU can buckle if the filament path isn’t tight and well guided, which can affect extrusion and adhesion.
  • Keep bed temperature moderate: Too hot can cause TPU to become gummy, while too cold reduces adhesion.

Conclusion

Good bed adhesion is the foundation of successful 3D prints, especially when working with PETG and TPU filaments. By preparing your bed carefully, adjusting printer settings, and using simple adhesion aids like glue sticks or tape, you can drastically improve your print success rate. Whether you’re making custom RC parts or flexible upgrades, these tips will help you get the best results every time.

Happy printing, and may your prints stick like glue!

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