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 and free from oils or dust; use isopropyl alcohol to wipe it down. Set your heated bed temperature between 70°C and 80°C for good adhesion. Apply a suitable adhesion aid like a PVA glue stick, blue painter’s tape, or a specialised PETG bed adhesive. Use a brim or raft in your slicer settings to increase the surface area and help hold the print down. Keep the first layer slow and slightly squished by lowering the nozzle closer to the bed—about 0.1 mm less than usual—to improve grip. Avoid drafts and sudden temperature changes around the printer, as PETG is sensitive to cooling too quickly. If your printer has an enclosure, use it to maintain a stable environment. Finally, check your cooling fan settings; reduce or turn off part cooling for the first few layers to minimise warping. Following these steps will greatly reduce PETG warping issues.