How to Prevent PETG Warping During 3D Printing

Question: How do I stop PETG from warping off the bed?

Answer: To prevent PETG from warping, start by ensuring your print bed is properly prepared. Use a clean, level bed and apply an adhesion aid like a PVA-based glue stick, blue painter’s tape, or specialised PETG adhesive sheets. Set your bed temperature between 70°C and 80°C to keep the first layer warm and stuck down. Print the first layer slower, around 20-30 mm/s, with a slightly thicker first layer height for better adhesion. Use a nozzle temperature of about 230-250°C, depending on your filament’s recommendations. Enclosing your printer or printing in a draft-free environment helps maintain consistent temperatures and reduces warping. If possible, enable a brim or raft in your slicer to increase the surface area in contact with the bed. Finally, avoid cooling the print too quickly; set your part cooling fan to a low speed or off for the first few layers. Following these steps should greatly reduce PETG warping issues.