.. PLA don't stick , warp print
I just update to new firmware my mk2.5 always printed very well 5years. Today I have update and now PLA warp and deform .
I tried to:
-Bed calibration (with 3.6 ,3.7 and try to calibrate again)
-change filament another brand
-wash bed with acetone and ipa
-check all axes screw and belt
-print xyz test cube
-change print setting bed temperature and nozzle too.
-try to downgrade firmware
I don't know what can I try..
If the PLA isn't sticking, it is contamination of the bed, the filament, or a poor first layer calibration. You've been doing this for a while, long enough to know what a first layer cal looks like, so we're back to contamination. Any chance your filament absorbed a lot of moisture recently? Have you tried a new spool fresh from the bag?