Quote Originally Posted by lakester View Post
Sounds like you might be somewhere in mid-build-another-printer, but if not, have you tried a long pre-heat on the bed, and then run ABL, and then print?

As an aside, I don't have ABL. Bed leveling had seemed very stable, so I guess I grew complacent. And then I installed a swamp cooler in the house. I'm guess'n it wasn't coincidence that things sorta got wonky not too long after that.

FWIW, I have a 12" HB mounted w/ springs all 4 corners, and the bed has warped significantly, though I haven't taken a dial indicator to it. I swore I had one somewhere, but alas.... Anyways, continuing the complacency theme, I guess I assumed that most of the dimensional stability came from the glass, and that the error the bed could introduce would be negligible. Before I either use or calibrate anything, I always pre-heat the bed..., and so operationally, the state the machine is in when in use remains fairly unchanging. Until..., I dump buckets of water into the air..., I think.
In my case, the preheat would have to be about 90 minutes. That would work, but it's a long time when I need to produce parts.

I'm in mid build on another printer and my current plan is to cannibalize the misbehaving i3 for parts, but who knows? It may live again one day.

Humidity can be a real problem for filament. Many types absorb water, which makes steam bubbles when printing. The swamp cooler probably isn't helping that.