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 surface with isopropyl alcohol to remove oils or dust. Use a suitable build surface like a PEI sheet, glass with a glue stick, or blue painter’s tape. Set your bed temperature between 70–80°C to improve adhesion. Adjust your first layer settings: print it slower (around 20–30 mm/s) and slightly thicker to improve grip. Use a brim or raft to increase the surface area contacting the bed, which helps hold corners down. Avoid drafts and sudden temperature changes around your printer by enclosing it or printing in a stable environment. Lastly, check your nozzle height during the first layer; it should be close enough to slightly squish the filament onto the bed without blocking extrusion. Following these steps will significantly reduce the chance of warping with PETG.