3d Printer printing PETG on PEI.
PEI is backed with self ashesive fridge magnet material. Glass plate is also backed with self adhesive fridge magnet material.
PEI is one of the best surfaces for printing PETG. In fact it can stick too well. PETG can be very hard to remove from a solid surface.
The PEI with magnetic backing acts just like solid surface when it is in place on the printer. When it is removed it becomes flexible so the parts can be removed easily.