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 properly prepared. Set the bed temperature between 70–80°C to promote good adhesion. Clean the bed surface thoroughly with isopropyl alcohol to remove oils and dust. Use a suitable build surface like a PEI sheet, glass with a thin layer of glue stick, or painter’s tape. Applying a light coat of glue stick can significantly improve adhesion. Level your bed carefully to maintain a consistent first layer height. Print the first layer slower, around 20–30 mm/s, and slightly squished to help it stick well. Additionally, avoid drafts and sudden temperature changes around your printer. If warping persists, consider using a brim or raft to increase the contact area with the bed. Finally, ensure your cooling fan is off or at a very low speed during the first few layers to avoid premature cooling. Following these steps will greatly reduce PETG warping and improve print success.