How to Prevent PETG from 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—use isopropyl alcohol to remove oils or dust. Set your bed temperature to around 70–80°C to promote adhesion. Use a suitable build surface like a PEI sheet, glass with a glue stick, or a specialised PETG-friendly tape. Applying a thin layer of PVA glue stick can also help. Enable a brim or raft in your slicer settings; a brim adds extra surface area to hold edges down. Keep your printing environment draft-free and, if possible, use an enclosure to maintain stable temperatures. Lower your first layer print speed (around 20–25 mm/s) and increase the first layer height slightly for better adhesion. Finally, avoid cooling fans on the first few layers, as cooling too quickly can cause warping. Following these steps should significantly reduce PETG warping issues.