Hey, the issue isn't solved yet. I have the same problem, aluminium plate, and kapton, applied in the Craftunique factory bubble-freely. With pla I didn't have any problem, but nylon warped off, so I started using glue stick, then I started getting the bubbles under every second print on the given surface area. I suspect that the adhesive under the kapton vaporises and cannot get back into normaby Keveeeeeee - General Mendel Topics