How to Prevent PETG Warping on the Print Bed

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

Answer: To prevent PETG from warping, start by ensuring your print bed is clean and free from oils or dust—use isopropyl alcohol for a good clean. Set your bed temperature between 70-80°C to improve adhesion. Use a suitable bed surface like PEI sheets, glass with a glue stick, or painter’s tape designed for 3D printing. Apply a thin layer of glue stick or hairspray if adhesion remains an issue. Level your bed carefully, making sure the nozzle distance is correct—too far and the first layer won’t stick well. Print the first layer slower, around 20-30 mm/s, and increase the extrusion width for better bed grip. Keep your printing environment draft-free; avoid cold air or open windows near the printer, as temperature fluctuations encourage warping. Finally, consider using a brim or raft to increase the surface area in contact with the bed, which helps hold down corners during printing. Following these steps will significantly reduce PETG warping issues.