X-Axis self test issue
Hello, I've had my Prusa MINI for a few years, and in the past year or so it cannot pass the X-Axis self test. My prints have been mostly satisfactory so I ignored it for awhile, but it seems there may be a recent firmware update that now nags me every time I start a print, so I've taken a closer crack at diagnosing.
No matter what I've tried so far, it consistently fails "rew X-Axis u/50 mm/s", landing above the target <182,192> range.
1902.452s [INFO - Selftest:10] X-Axis Started
1902.555s [INFO - Marlin:10] enqueueing "G28 X I D P"
1902.555s [INFO - Selftest:10] X-Axis home single axis
1902.653s [INFO - Marlin:10] endstops hit: X:-1.76 Y:-3.16
1902.757s [INFO - Marlin:10] endstops hit: X:2.40 Y:-3.16
1902.788s [INFO - Marlin:10] X:180.40 Y:-3.16 Z:4.00 E:0.00 Count X:18040 Y:-316 Z:1600
1902.988s [INFO - Selftest:10] fwd X-Axis u/50 mm/s
1902.988s [INFO - Marlin:10] X:180.40 Y:-3.16 Z:4.00 E:0.00 Count X:18040 Y:-316 Z:1600
1907.004s [INFO - Marlin:10] endstops hit: X:-7.44
1907.054s [INFO - Marlin:10] X:-7.44 Y:-3.16 Z:4.00 E:0.00 Count X:-744 Y:-316 Z:1600
1907.054s [INFO - Selftest:10] X-Axis measured length = 188.239990mm out in range <182.000000,192.000000>
1907.088s [INFO - Selftest:10] rew X-Axis u/50 mm/s
1907.088s [INFO - Marlin:10] X:-7.44 Y:-3.16 Z:4.00 E:0.00 Count X:-744 Y:-316 Z:1600
1911.104s [INFO - Marlin:10] endstops hit: X:180.40
1911.154s [INFO - Marlin:10] X:180.40 Y:-3.16 Z:4.00 E:0.00 Count X:18040 Y:-316 Z:1600
1911.154s [ERROR - Selftest:10] X-Axis measured length = 193.279999mm out of range <182.000000,192.000000>
I I've tried loosening/tightening the belt, using the belt tuner app, but I can only get the X-Axis measured length to vary by tiny amounts.
487.468s [ERROR - Selftest:10] X-Axis measured length = 193.429993mm out of range <182.000000,192.000000>
1070.794s [ERROR - Selftest:10] X-Axis measured length = 193.279999mm out of range <182.000000,192.000000>
1574.927s [ERROR - Selftest:10] X-Axis measured length = 193.289993mm out of range <182.000000,192.000000>
1911.154s [ERROR - Selftest:10] X-Axis measured length = 193.279999mm out of range <182.000000,192.000000>
Can anyone advise what I'm missing? Thanks in advance.
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RE: X-Axis self test issue
Add washers to the rods so you will limit the distance the print head can move.
Also double check the grub screw on the x axis of the motor if it is fixed so that the axis is not spinning while the belt is not moving.
See my GitHub and printables.com for some 3d stuff that you may like.