MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point
 
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[Solved] MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point  

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Jo
 Jo
(@jo)
New Member
MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point

Hi Community,

after finishing my MK3S kit build, I thougth I'd be ready to start printing. But the assistent for the initial calibration seems not to be statisfied by my work :-(.

When trying to locate the right rear calibration point, the log produces the following output line after line:

`xyzcal_find_bed_induction_sensor_point_xy x=22000 y=19800 z=2910
point=2 x=22000 y=19800 z=2910
xyzcal_meassure_enter
xyzcal_searchZ x=22000 y=19800 z=2910
xyzcal_spiral8 cx=22000 cy=19800 z0=2910 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2910 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2810 dz=100 radius=-900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2710 dz=100 radius=900 ad=3
xyzcal_spiral2 cx=22000 cy=19800 z0=2610 dz=100 radius=-900 ad=2
xyzcal_spiral8 cx=22000 cy=19800 z0=2510 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2510 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2410 dz=100 radius=-900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2310 dz=100 radius=900 ad=3
xyzcal_spiral2 cx=22000 cy=19800 z0=2210 dz=100 radius=-900 ad=2
xyzcal_spiral8 cx=22000 cy=19800 z0=2110 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2110 dz=100 radius=900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=2010 dz=100 radius=-900 ad=0
xyzcal_spiral2 cx=22000 cy=19800 z0=1910 dz=100 radius=900 ad=3
ON-SIGNAL at x=21641 y=19443 z=1854 ad=1857
sizeof(block_buffer)=1392
sizeof(total)=1080
xyzcal_scan_pixels_32x32 cx=22000 cy=19800 min_z=1782 max_z=2400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`

Then, within a moment the follwoing lines are added (as some kind of computed result?) and the calibration stops with the error message:

` 0 858
1 24
2 17
3 10
4 23
5 24
6 5
7 0
8 0
9 1
10 5
11 2
12 1
13 0
14 5
15 49
max_c=49 max_l=15
min=120 max=128 dif=8
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000000000000000000000000000
ffffff0000000000000000000000000000000000000000000000000000000000
ffffffffffffffff000000000000000000000000000000000000000000000000
ffffffffffffffffffffff000000000000000000000000000000000000000000
ffffffffffffffffffffffff0000000000000000000000000000000000000000
ffffffffffffffffffffffffffffff0000000000000000000000000000000000
ffffffffffffffffffffffffffff000000000000000000000000000000000000
max_c=0 max_r=0 max_match=0
xyzcal_meassure_leave
echo:busy: processing
echo:busy: paused for user`

I've done the tweaks mentioned in other issues, like lowering the probe, conrolling belt tension, looking for possible colliding items and so on, but I'm running into this over and over again.
When looking at the "results" of points 0 and 1, there is no field of zeroes, but some kind of filtered(?) result of the first part of the measurement.

Any further suggestions for dealing with this?
Kind regards
Jo

This topic was modified 2 years ago by Jo
Posted : 04/05/2019 7:22 pm
--
 --
(@)
Illustrious Member
RE: MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point

There is a rare chance your bed is missing the metal insert ... but generally this problem is caused by a PINDA being too high off the fiberglass bed, and thus unable to detect the metal insert.  If lowering the PINDA a millimeter did not help - you should contact Prusa Tech Support and talk them through what you have tried. 

Posted : 04/05/2019 10:56 pm
Vojtěch
(@vojtech-3)
Honorable Member
RE: MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point

When you look at the numbers, there is a clear round spot, which I believe is the right spot. It's properly detected. But then the firmware decides, the spot in lower left corner is much, much more intense and tries to calibrate on that. It is likely the screw that's nearby.

Which would mean that the firmware doesn't expect to see the screw in the scan. Which would mean that your [0,0] home position is offset and the printer is searching in a slightly different area and finds more than it hoped for. Which would mean that something has offset your home position - and since the printer doesn't have endstops and is measuring simply by finding where it can't move anymore, it'd suggest that the Y axis can't reach the full extent in the back by a few milimeters. Is something blocking it perhaps? (it may also be the X axis possibly)

Posted : 04/05/2019 11:25 pm
Jo
 Jo
(@jo)
New Member
Topic starter answered:
RE: MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point

Thank you very much for your support, your idea was perfectly right. The missing millimeter on the y-axis was the cause.

Kind regards

Jo

Posted : 05/05/2019 6:05 pm
Vojtěch
(@vojtech-3)
Honorable Member
RE: MK3S, FW3.7.0-2201, XYZ Calibration fails regularly on 3rd point
Posted by: Hobbyingenieur

Thank you very much for your support, your idea was perfectly right. The missing millimeter on the y-axis was the cause.

It was a long shot. I'm glad it helped.

Posted : 05/05/2019 8:26 pm
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