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 using a heated bed set to around 70-80°C. Clean the bed surface thoroughly with isopropyl alcohol to remove grease or dust. Apply a thin layer of glue stick or specialised PETG adhesive on the bed to improve adhesion. Use a suitable print surface like PEI sheets, glass with glue stick, or a BuildTak sheet. Ensure the first layer prints slowly (around 20-30 mm/s) and slightly squished by adjusting the Z-offset so the filament bonds well. Avoid drafts and sudden temperature changes by enclosing your printer or printing in a stable environment. Finally, enable a brim or raft in your slicer settings to increase the surface area holding the print down. These steps together significantly reduce warping and help your PETG prints stick firmly throughout the job.