Brainstorming a problem: My well-used Mini seems to have developed poor adhesion, focused on the right side of the print plate. Prints at the center of the plate still adhere very very well, and prints toward the left adhere well except at the extremities. Could the bed heating element be failing? Or could it be not getting enough power? Prints are otherwise very good & clean, caveat whatever knock-on effects the warping may have.
Details & Background—
The main symptom of this is that large pieces that previously printed fine are now warping at the extremities, especially on the right side of the plate. What’s making me think poor adhesion more than other warping issues is that smaller and curved pieces on the right and extremities print fine but don’t need to be pried off once the bed hits the release temperature (50 deg, for HIPS), as they have in the past and do elsewhere on the plate. It also might be the case that areas close to the print plate in at least some areas are being subjected to more heat; overhangs close to the plate seem not as crisp as before.
There’s been no significant change in settings or environment.
I have an enclosure (the official acrylic one).
This is with a fairly new PEI sheet that shows no sign of bubbling, wear, or other problems, and previously printed fine.
I did have a problem late in the summer in which a wire to the heating element had broken, which I then replaced (individually by splicing in a patch to the existing connectors, not with a whole new wire harness).