The printer is a modified Tevo Tarantula, and I'm printing with PLA. Only one extruder, and using the same termperiatures I've used for many other smaller parts. This has happened on two different larger parts, so it is a consistent problem. Smaller parts do not exhibit this problem.
You don't say what printer or material, but here is a completely random possibility when this started happening to me recently when normally I am fighting to get PLA off the bed.
I had dual extruder set up, one PLA, one ABS. I was printing something *entirely* in PLA, but because the ABS extruder wasn't disabled, Cura heated the bed up to ABS temp (Cura, please don't do this!). Turns out PLA will adhere to a bed this hot (I think it was 85 or something), but it is reaaaal soft and tends to curl up and corners.
Of course, there about a zillion other reasons too.
Link to post
Share on other sites