How to Prevent PETG Warping on the Print Bed

Question: How do I stop PETG from warping off the bed?

Answer: To prevent PETG warping, start by ensuring your print bed is clean and free from grease or dust. Use isopropyl alcohol to wipe the surface. Set the bed temperature between 70°C and 80°C to improve adhesion. Apply a suitable adhesive like a glue stick, blue painter’s tape, or specialised print surface such as PEI sheets. Use a brim or raft in your slicer settings to increase the contact area with the bed, reducing edge lifting. Ensure your first layer prints slowly and at a slightly higher temperature (around 240–250°C) for good bonding. Avoid drafts and sudden temperature changes by enclosing your printer if possible. Finally, make sure your bed is level and the nozzle is at the correct height to achieve good first-layer squish. Following these steps will greatly reduce the chance of warping with PETG.