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 from grease—use isopropyl alcohol for a thorough clean. Set your bed temperature to around 70-80°C to help the first layers stick better. Applying a thin layer of glue stick or a specialised PETG adhesive can improve adhesion. Use a suitable build surface like PEI sheets or glass with a light coating of hairspray. Print the first layer slightly slower and at a higher extrusion temperature (around 240-250°C) to promote good bed bonding. Enable a brim or raft in your slicer settings to increase the adhesion area. Also, avoid drafts and rapid cooling by enclosing your printer or printing in a warm room to maintain consistent temperatures. Finally, check your bed levelling carefully—an even first layer is crucial to prevent corners lifting. Following these steps will greatly reduce warping and improve your PETG prints.