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Unable to calibrate after changing PEI sheet.  

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fl0PPsy
(@fl0ppsy)
Eminent Member
Unable to calibrate after changing PEI sheet.

For some reason the printer (MK2, still waiting for the MK2S upgrade kit) just wont calibrate after having removed the heatbed and changing the PEI sheet. It fails after running the initial 4 point test 3 times and then just displays the "XYZ Calibration failed. Please consult the manual." message. I've now tried the followinmg things in the order indicated:-

1. Checked that all screws are tight and each axis is moving freely.

2. Checked the Pinda probe height and moved it down closer to the bed and also higher.

3. Checked that all cables are plugged in properly.

4. Ran SelfTest and all checks came back OK

5. Checked that the Pinda probe was working by moving the X axis back and forth and putting a metal object near the probe. In each test I could see the Pinda light go off and the End point check screen also showed the Pinda reacting.

6. Checked Z frame alignment by removing bed, remeasuring and adjusting the distance of the washer after the counter nut and Y-axis corner to ensure its 100mm.

7. Performed visual check to make sure that X-axis rods line up with lines on print bed.

8. Reseated Y-Axis end stop just to make sure.

9. Downgraded firmware to check if it made a difference which it didnt and then reflashed the latest 3.0.12 Final firmware.

10. Sent the "M502" gcode to reset all settings back to factory defaults.

11. Ran Calibration via Pronterface using the "M45 V2" gcode. Most of the previous Calibration runs were also done using this gcode. The following output was produced by the latest run:-

>>>M45 V2
SENDING:M45 V2
Iteration: 1
correction angles: -0.37473, 0.46578
X vector, adjusted: 1.00007, 0.00654
Y vector, adjusted: 0.00813, 1.00009
center, adjusted: -1.35973, 0.75973
Difference after correction:
point #0measured: (113.26000, -0.60250); measured-corrected: (112.63252, -0.49477); target: (114.00000, -2.00000), error: 0.64
point #1measured: (213.22000, 98.11501); measured-corrected: (214.43681, 98.17433); target: (215.00000, 96.00000), error: 1.22
point #2measured: (114.70000, 195.65499); measured-corrected: (114.22605, 195.52214); target: (114.00000, 194.00000), error: 0.49
point #3measured: (11.70000, 96.79000); measured-corrected: (11.42167, 96.84651); target: (12.00000, 96.00000), error: 0.28
Iteration: 2
correction angles: -0.34320, 0.37533
X vector, adjusted: 1.00006, 0.00599
Y vector, adjusted: 0.00655, 1.00006
center, adjusted: -1.38007, 0.81468
Difference after correction:
point #0measured: (113.16251, -0.48500); measured-corrected: (112.61336, -0.50253); target: (114.00000, -2.00000), error: 0.55
point #1measured: (212.92999, 98.01500); measured-corrected: (214.26113, 98.10845); target: (215.00000, 96.00000), error: 1.33
point #2measured: (114.32500, 195.68750); measured-corrected: (113.89739, 195.50935); target: (114.00000, 194.00000), error: 0.46
point #3measured: (11.73500, 96.80251); measured-corrected: (11.24953, 96.89240); target: (12.00000, 96.00000), error: 0.49
Iteration: 3
correction angles: -0.33239, 0.31355
X vector, adjusted: 1.00005, 0.00580
Y vector, adjusted: 0.00547, 1.00005
center, adjusted: -1.34515, 0.79582
Difference after correction:
point #0measured: (113.19667, -0.71667); measured-corrected: (112.64945, -0.54289); target: (114.00000, -2.00000), error: 0.57
point #1measured: (212.83331, 97.97834); measured-corrected: (214.19068, 98.04768); target: (215.00000, 96.00000), error: 1.36
point #2measured: (114.12667, 195.63000); measured-corrected: (113.72211, 195.46630); target: (114.00000, 194.00000), error: 0.44
point #3measured: (11.74000, 96.80334); measured-corrected: (11.18082, 96.86994); target: (12.00000, 96.00000), error: 0.56

Does anyone see anything that might indicate what the problem is in the output above?

At this stage I'm not sure what else I could check or change so I'd love to hear some ideas from others that have run into a similar issue?

Posted : 05/08/2017 6:49 am
fl0PPsy
(@fl0ppsy)
Eminent Member
Topic starter answered:
*SOLVED*: Unable to calibrate after changing PEI sheet.

This issue has now been solved.

The problem seems to have been caused by a damaged X axis belt.

After tearing the whole printer down to parts and starting a full rebuild I noticed that the teeth on the X axis belt had been stretched apart somehow for a 2cm section.

I ordered a 10m length of GT2 2mm Pitch, 6mm Wide timing belt off a local vendor on eBay and cut it to length. The printer calibrated straight away with a slight skew but I'll fix that later when I do the MK2S upgrade.

So there you go people. Add checking belts for any kind of damage even if they look fine when mounted on the printer to your troubleshooting list.

The interesting thing is this new belt is quieter and it seems to sit better and doesnt rub on the rollers.. I think I'll swap out the Y axis belt also.

Posted : 16/08/2017 4:35 am
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