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 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 your bed temperature between 70–80°C to improve adhesion. Apply a thin, even layer of glue stick or a specialised adhesive if needed. Adjust your nozzle temperature to around 230–250°C depending on the filament brand. Print the first layer slowly (15–20 mm/s) and slightly thicker (0.2–0.3 mm) to help it stick. Enable a brim or raft in your slicer settings to increase the contact area with the bed. Avoid drafts and sudden temperature changes by printing in an enclosed or draft-free environment. Finally, calibrate your bed level carefully so the nozzle is close enough without scraping. Following these steps will greatly reduce PETG warping and improve print success.