How to Prevent PETG Warping from 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 properly prepared. Clean the bed surface with isopropyl alcohol to remove oils and dust. Use a suitable build surface like a PEI sheet, glass with a glue stick, or blue painter’s tape. Set the bed temperature between 70–80°C to improve adhesion. For the nozzle, 230–250°C works well with most PETG brands. Enable a brim or raft in your slicer settings to increase the contact area with the bed, reducing edge lifting. Make sure your first layer is slow and slightly squished onto the bed, around 20–30% slower than normal print speed. Avoid drafts and sudden temperature changes around your printer by enclosing it or printing in a stable environment. Finally, check your bed levelling carefully; an uneven bed can cause poor adhesion and warping. Following these steps will significantly reduce PETG warping and improve print success.