7 hours ago, geert_2 said:What you can always try to see if there is a mechanical obstruction: switch the printer off, and then manually rotate the Z-screw to see if the bed comes up, and feel if there is anything blocking rotation. If that works fine, gently try pulling the bed upwards manually by hooking your fingertips under the bed, but only at the back near the guiding rods, not in front. Normally you can pull up the bed in this way. This should let you differentiate whether it is a mechanical issue, e.g.: dirt in the Z-screw. Or whether it is an electrical or electronic problem, e.g.: steppermotor or drivers, or a Z-stop switch that is defective so the printer can't find it and keeps pushing the bed down to try to reach it, to know where the Z-zero position is. The printer does not know where the bed is when switched on, so it first has to move the bed down to activate the Z-stop switch to find the zero-position. Only then it can move the bed upwards safely by counting steps up, and not crash into the nozzles. My guess is that it is this Z-switch that does not give proper contact, or that came loose and dislocated. But as said, this is a guess...
Yea it is a mechanical obstruction. For some reason the two white angled plastic pieces hiding the motors and cables are in the way of the bed now. They press against the metal arms that hold the buildplate. I haven't figured out why all the sudden they don't fit though...they were still seated in the slots properly.
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geert_2 558
What you can always try to see if there is a mechanical obstruction: switch the printer off, and then manually rotate the Z-screw to see if the bed comes up, and feel if there is anything blocking rotation. If that works fine, gently try pulling the bed upwards manually by hooking your fingertips under the bed, but only at the back near the guiding rods, not in front. Normally you can pull up the bed in this way. This should let you differentiate whether it is a mechanical issue, e.g.: dirt in the Z-screw. Or whether it is an electrical or electronic problem, e.g.: steppermotor or drivers, or a Z-stop switch that is defective so the printer can't find it and keeps pushing the bed down to try to reach it, to know where the Z-zero position is. The printer does not know where the bed is when switched on, so it first has to move the bed down to activate the Z-stop switch to find the zero-position. Only then it can move the bed upwards safely by counting steps up, and not crash into the nozzles. My guess is that it is this Z-switch that does not give proper contact, or that came loose and dislocated. But as said, this is a guess...
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