Wow, not sure whats going on with yours. I printed this lid for my Torrent drone case last night in PETG with carbon fiber, about a 5 1/2 hour print, about 6 x 7", no issues with adhesion or warping. Printed on my Klic N Print 3D, 250/60C temps, using Makerbot ABS profile in S3D, on glass table with hairspray.... see pic below.


Here is something that I coincidentally got in my e-mail yesterday that may help. It is a PETG how-to from MatterHackers that discusses build table materials, adhesion, temps, etc.

http://mailchi.mp/matterhackers/f1yk...9?e=4a193f004f




PETG lid.JPG