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 clean and free of oils or dust; use isopropyl alcohol for cleaning. Set your bed temperature between 70°C and 80°C to help the filament stick better. Use a suitable build surface like a PEI sheet, glass with a glue stick, or painter’s tape designed for PETG. Apply a thin layer of glue stick or hairspray if needed for extra adhesion. Calibrate your first layer to be slightly squished onto the bed by adjusting the Z-offset, ensuring good contact without nozzle clogging. Reduce drafts around your printer by enclosing it or printing in a stable environment, as PETG is sensitive to temperature changes. Print with a slower first layer speed (15-20 mm/s) to improve adhesion. Finally, consider using a brim or raft to increase surface area and hold the edges down. Following these steps will significantly reduce warping and improve print success with PETG.