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 clean—use isopropyl alcohol to remove grease or dust. Set the bed temperature between 70°C and 80°C to help the first layer stick properly. Use a suitable build surface like a PEI sheet, glass with a glue stick, or blue painter’s tape for better adhesion. Apply a thin layer of glue stick or specialised adhesive if needed. Level your bed carefully and adjust the nozzle height so the first layer is slightly squished onto the bed. Print the first layer slower, around 20-30 mm/s, to improve adhesion. Enclosing the print area or printing in a room without drafts helps maintain temperature stability and reduces warping. Finally, avoid cooling fans on the first few layers; switch them on gradually after the base is solid. These steps should significantly reduce PETG warping and improve your print success rate.