Failing X and Y Calibration after working for two months.
I have a core one kit,
This is my first 3D printer and has been working well for some time. I have tried to keep up to date with Prusa's advice and new software and firmware updates. The printer has been running the latest Beta FW for about a month with no issues up to now.
I was running a tall, 9 hour print that failed half way through the print, probably because I didn't have enough supports in place and the pressure of the nozzle and maybe a filament splurge was just enough to cause it to be pushed over without the supports. I learned a lesson.
Randomly I thought I would re run the calibration, and to my surprise the Y axes fails every time and X occasionally passing. I redid the print file and added some more supports using the everywhere tag and I have now printed a pair of them over two separate sessions, ignoring the calibration warnings. I have to say they are quite good and meet my expectations.
However try as I might I cannot get the calibration passed and off course have to bypass the warning messages.
In Prusa connect I can control the X and Y axes with no warnings there is a gentle thud as it gets to the far left hand extremity 0,220, but that's it.
When I control the Y axis towards the RHS front I can see approx. -18 mm and 219 when it moves to the rear RHS as the offset on the core one LCD screen.
Possibly is this outside the software Pass parameter, as really the printer seems to be working for me.
I would just like to see two green ticks against the calibration. Only other thing to note, as it is a change, is that I have added the Prusa Hepa filter package and I have used the accelerometer to modify parameters.
When I first spotted the calibration fail I did try a factory reset, so it was not using any modified parameters but it still failed. I have subsequently gone back and used the accelerometer to modify the input shaper and phase stepping the belts are at the newer tension (measured on the phone app, I like the graph) and both are within limits.
Obviously any thought or advice would be well appreciated.
Many thanks.
RE:
Seems people run into this issue when the Bowden tube is routed on the wrong side of the main cable. If this happens then the main cable textile sleeve can sag and it gets wedged up against the x-axis motor housing when hitting 0,220. This might not be your case but double check that it looks like this: Securing the PTFE tube
RE: Failing X and Y Calibration after working for two months.
@hyiger many thanks for your advice.
You were right the PTFE tube had moved down somewhat, consequently I re did the Velcro tie wraps and repositioned the PTFE tube.
Unfortunately it doesn't give me a little green tick against the Y calibration, X does seem to be working fine now.
I will continue trying to sort this out, many thanks for your advice I guess with prolonged usage the PTFE tube can work it way into the wrong place and affect calibration, but it seem like it isn't the only part of my Y calibration issue.
RE: Failing X and Y Calibration after working for two months.
@hyiger many thanks for your advice.
You were right the PTFE tube had moved down somewhat, consequently I re did the Velcro tie wraps and repositioned the PTFE tube.
Unfortunately it doesn't give me a little green tick against the Y calibration, X does seem to be working fine now.
I will continue trying to sort this out, many thanks for your advice I guess with prolonged usage the PTFE tube can work it way into the wrong place and affect calibration, but it seem like it isn't the only part of my Y calibration issue.
For Y calibration, make sure the gantry is still square with the frame. If the bracket connecting the linear rail to the Y axis bearing is even slightly bent out of 90 degrees then Y calibration will fail. Also check that Y-axis bearing on the right side is not getting snagged in a cable.
RE: Failing X and Y Calibration after working for two months.
Taking The point above about squareness.
I completely loosened the Drive belts off and indeed the bed was not completely square with the belts loose.
I applied approx. five complete turns to the belt adjuster at the LHS and 4 turns too the RHS belt and started tuning.
On the phone app I skipped over the upper belt and went to the lower belt and started tuning to get it back to the middle of the band. Once that was good i switched back to the upper belt and tuned that into the middle of the band and hey presto the calibration now passes.
Many thanks Hyiger.