How to Prevent PETG Warping from 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 level and clean—use isopropyl alcohol to remove grease or dust. Set the bed temperature between 70–80°C to improve adhesion. Use a suitable build surface like a PEI sheet, glass with a thin layer of glue stick, or blue painter’s tape. Applying a brim or raft in your slicer can help anchor the edges and reduce warping. Print with a slower first layer speed (around 20–30 mm/s) and increase the first layer height slightly for better grip. Avoid drafts and sudden temperature changes by enclosing your printer or printing in a warm, stable environment. Finally, ensure your nozzle temperature is correct (generally 230–250°C for PETG) to promote good layer bonding without causing excessive stringing. Following these steps will significantly reduce warping and improve your PETG prints.