I'm printing Ninjaflex with a Flexystruder on a Taz 4 and the results are generally outstanding. However, on large prints I do experience a bit of warping that can pull corners off the bed and distort the print slightly. I'm printing at 220 degrees onto a 40 degree glass bed. I've tried a thin PVA solution and without and I always make sure the glass is squeaky clean (acetone, windex, etc...).
Anybody have any suggestions about how I might increase adhesion?