Z Axis presses down on bed
We have an MK4 that we have had for about 4 or 5 months and have used extensively and it's been working great. Today, though, for some reason the z axis is messing up. I press the z calibration and it moves down until it is pressing hard on the print bed (enough to actually make it flex a bit). At this point the nozzle is probably about a cm below the flat position or so. The printer is still trying to spin the motors like it's trying to go further down. I also tried the load cell test and it passed so it should be sensing the pressure as far as I can tell. I tried to let it go to see if it would figure it out but it just kept pressing down for a good minute or two and then went further up but then just went straight back down and did it again. I just reset it at this point but that seems to be all it will do with the z axis at this point.
Any help is appreciated. Want our printer back :(. Do I need to factory reset? We are on firmware 5.1.2.
RE: Z Axis presses down on bed
Just an update, we have tried factory reset and using firmware versions 4.7.2, 5.0.0, and 5.1.2 all with the same basic result. Here is a video of what it does trying the z axis test:
https://photos.app.goo.gl/psfLgV1Y4d25H39r9
It says check that the load cell is working right but every time I run the load cell test it works normally.