lionel.p wrote: ↑Apr 03, 2018 8:35 amI had random issues with the 4th calibration point as well and actually damaged my PEI sheet. The problem was due to zip ties near the spiral wrap ( https://d17kynu4zpq5hy.cloudfront.net/i ... Jo2i.large) that were actually "slightly" messing with the x-endstop on some occasion. One time it was enough to crash the hot hotend on this particular 4th point and melt the PEI sheet (I will replace this one later as it is now an issue when I need to redo a full calibration). Moving the zipties/wrap eliminated the problem since then.
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