xyz calibration loosing y homing
Hi
I got a problem with my mk3 when calibrting, at the end of the 4th searching point it seems like the pursa loose the y home position and it take the last y position as home postion so it fail on the improving point step.
I recorded all my steps : .
what am I doing wrong?
Re: xyz calibration loosing y homing
This is indeed odd... it should go back to the home position before "improving the calibration" portion starts. I would check to ensure you do not have something dragging on the Y-Axis when it is at the 4th point before it is supposed to come back home. Maybe re-flash the firmware to ensure you have a good firmware.
Re: xyz calibration loosing y homing
I did re-flash it several times, tried to downgrade the firmware, same results.
nothing block on the y axis from moving back.
Re: xyz calibration loosing y homing
By any chance did you add a camera mount to the "frog" (heatbed mounting structure)?
Had a zip tie get in my way once...
Re: xyz calibration loosing y homing
no nothing added...
I did with it 2 perfect prints.
when doing the 3rd one it lost y position.
I tried to re-calibrate the axis but had no luck
Re: xyz calibration loosing y homing
The only additional thing I can add is the 'jerky' behavior when it is checking the x and y axis early in the video. I don't recall this behavior when I did my setup. Maybe check your wiring to make sure all is tight and properly plugged in.
Re: xyz calibration loosing y homing
I already re-wired 3 times my board.
I'm thinking it may be a problem with the Y axis motor driver on the board....
Re: xyz calibration loosing y homing
I had this issue recently (after about 140 hours of printing on a pre-assembled machine) and it appears to have been caused by a bad linear bearing which, in turn, scratched one of the Y-axis smooth rods. The self-test actually failed on mine on its original firmware (3.1.0 RC4--Y-axis length error) but passed on the latest 3.1.3 FW. Before I did a factory reset I was unable to even do the XYZ calibration because the printer wouldn't properly rehome Y. The only reason I was able to attempt to calibrate it after the reset was because one of the changes in 3.1.3 allowed the self-test to pass, and the self-test puts the bed in the correct position to start calibration.
If you disconnect the Y-axis belt and move the carriage by hand is there any noticeable drag? Also, are there any scratches or gouges on the smooth rods?