RRC
Rat Rig Community [Unofficial]•3w ago
evilC

VC4 making deep gouges in print bed

When my VC4 (With beacon) prints, it makes deep gouges in the bed (Measured in excess of 0.2mm with calipers). When it does a beacon contact probe, it's fine, it makes no marks. When I was printing earlier on the stock RR PEI plate, it was fine. However, since swapping to my BuildTak Nylon+ build plate, I am having this problem. This build plate is much thicker than the stock RR one. However, as far as I was led to believe, beacon contact should detect the difference between what the eddy sensor says, and what the contact says, and adjust accordingly. And no, it's nothing to do with temperatures. I tried printing PLA on this sheet like I do with the stock sheet, and I get the same issue. I did try the Beacon Scan Compensation, but that did not seem to help. All of my beds have about 0.1mm deviation between high and low point, so I don't think it's anything to do with meshes. Can someone please advise as to how to debug what's going on. I am terrified to switch back to my RR build plate in case it damages that so the printer is effectively useless until I can sort this out
3 Replies
evilC
evilCOP•3w ago
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evilC
evilCOP•3w ago
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evilC
evilCOP•3w ago
Did some BEACON_OFFSET_COMPARE tests Nylon+ sheet (The problematic one): 
Delta:     1112.401 um
Proximity: 0.03318 mm
Contact:   1.14558 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.145374
probe at 150.000,150.000 is z=1.145999
probe at 150.000,150.000 is z=1.145374
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.162561
probe at 150.000,150.000 is z=1.148186
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.153811
probe at 150.000,150.000 is z=1.144749
probe at 150.000,150.000 is z=1.149436
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.162249
probe at 150.000,150.000 is z=1.145999
probe at 150.000,150.000 is z=1.141624
probe at 150.000,150.000 is z=1.126936

Delta:     1114.584 um
Proximity: 0.03225 mm
Contact:   1.14683 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.146311
probe at 150.000,150.000 is z=1.148499
probe at 150.000,150.000 is z=1.145686
probe at 150.000,150.000 is z=1.134749

Delta:     1111.342 um
Proximity: 0.03174 mm
Contact:   1.14308 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.140686
probe at 150.000,150.000 is z=1.144749
probe at 150.000,150.000 is z=1.143811
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.144124
probe at 150.000,150.000 is z=1.135061
probe at 150.000,150.000 is z=1.140999
probe at 150.000,150.000 is z=1.139749
Delta:     1112.401 um
Proximity: 0.03318 mm
Contact:   1.14558 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.145374
probe at 150.000,150.000 is z=1.145999
probe at 150.000,150.000 is z=1.145374
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.162561
probe at 150.000,150.000 is z=1.148186
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.153811
probe at 150.000,150.000 is z=1.144749
probe at 150.000,150.000 is z=1.149436
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.162249
probe at 150.000,150.000 is z=1.145999
probe at 150.000,150.000 is z=1.141624
probe at 150.000,150.000 is z=1.126936

Delta:     1114.584 um
Proximity: 0.03225 mm
Contact:   1.14683 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.146311
probe at 150.000,150.000 is z=1.148499
probe at 150.000,150.000 is z=1.145686
probe at 150.000,150.000 is z=1.134749

Delta:     1111.342 um
Proximity: 0.03174 mm
Contact:   1.14308 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=1.140686
probe at 150.000,150.000 is z=1.144749
probe at 150.000,150.000 is z=1.143811
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=1.144124
probe at 150.000,150.000 is z=1.135061
probe at 150.000,150.000 is z=1.140999
probe at 150.000,150.000 is z=1.139749
Stock RR sheet: 
Delta:     -120.039 um
Proximity: 0.49302 mm
Contact:   0.37298 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.374436
probe at 150.000,150.000 is z=0.372874
probe at 150.000,150.000 is z=0.371624
probe at 150.000,150.000 is z=0.362874

08:48
Delta:     -118.098 um
Proximity: 0.49160 mm
Contact:   0.37350 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.376624
probe at 150.000,150.000 is z=0.371624
probe at 150.000,150.000 is z=0.372249
probe at 150.000,150.000 is z=0.370061

Delta:     -119.093 um
Proximity: 0.49343 mm
Contact:   0.37433 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.375374
probe at 150.000,150.000 is z=0.373811
probe at 150.000,150.000 is z=0.373811
probe at 150.000,150.000 is z=0.371311
Delta:     -120.039 um
Proximity: 0.49302 mm
Contact:   0.37298 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.374436
probe at 150.000,150.000 is z=0.372874
probe at 150.000,150.000 is z=0.371624
probe at 150.000,150.000 is z=0.362874

08:48
Delta:     -118.098 um
Proximity: 0.49160 mm
Contact:   0.37350 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.376624
probe at 150.000,150.000 is z=0.371624
probe at 150.000,150.000 is z=0.372249
probe at 150.000,150.000 is z=0.370061

Delta:     -119.093 um
Proximity: 0.49343 mm
Contact:   0.37433 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.375374
probe at 150.000,150.000 is z=0.373811
probe at 150.000,150.000 is z=0.373811
probe at 150.000,150.000 is z=0.371311
OK that's very odd. For the nylon sheet, Contact is bigger than proximity. It's the other way around for the RR sheet When I first did BEACON_INITIAL_CALIBRATION it was with the RR PEI sheet. I re-did BEACON_INITIAL_CALIBRATION now with the Nylon sheet, and now I get: Nylon: 
Delta:     0.936 um
Proximity: 0.02621 mm
Contact:   0.02715 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.029542
probe at 150.000,150.000 is z=0.027042
probe at 150.000,150.000 is z=0.024854
probe at 150.000,150.000 is z=0.021417

Delta:     1.544 um
Proximity: 0.02414 mm
Contact:   0.02569 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.026104
probe at 150.000,150.000 is z=0.024542
probe at 150.000,150.000 is z=0.026417
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=0.023917
probe at 150.000,150.000 is z=0.015479
probe at 150.000,150.000 is z=0.012979

Delta:     2.614 um
Proximity: 0.02401 mm
Contact:   0.02663 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.024854
probe at 150.000,150.000 is z=0.027667
probe at 150.000,150.000 is z=0.027354
probe at 150.000,150.000 is z=0.015479
Delta:     0.936 um
Proximity: 0.02621 mm
Contact:   0.02715 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.029542
probe at 150.000,150.000 is z=0.027042
probe at 150.000,150.000 is z=0.024854
probe at 150.000,150.000 is z=0.021417

Delta:     1.544 um
Proximity: 0.02414 mm
Contact:   0.02569 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.026104
probe at 150.000,150.000 is z=0.024542
probe at 150.000,150.000 is z=0.026417
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=0.023917
probe at 150.000,150.000 is z=0.015479
probe at 150.000,150.000 is z=0.012979

Delta:     2.614 um
Proximity: 0.02401 mm
Contact:   0.02663 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=0.024854
probe at 150.000,150.000 is z=0.027667
probe at 150.000,150.000 is z=0.027354
probe at 150.000,150.000 is z=0.015479
RR PEI: 
Delta:     -1109.520 um
Proximity: 0.45073 mm
Contact:   -0.65879 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.661708
probe at 150.000,150.000 is z=-0.659208
probe at 150.000,150.000 is z=-0.655458
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=-0.627646
probe at 150.000,150.000 is z=-0.753583
probe at 150.000,150.000 is z=-0.706708

Delta:     -1152.807 um
Proximity: 0.44975 mm
Contact:   -0.70306 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.702333
probe at 150.000,150.000 is z=-0.703271
probe at 150.000,150.000 is z=-0.703583
probe at 150.000,150.000 is z=-0.718271

Delta:     -1115.480 um
Proximity: 0.44961 mm
Contact:   -0.66587 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.667021
probe at 150.000,150.000 is z=-0.662333
probe at 150.000,150.000 is z=-0.668271
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=-0.658583
probe at 150.000,150.000 is z=-0.670458
probe at 150.000,150.000 is z=-0.670146
probe at 150.000,150.000 is z=-0.662333
Delta:     -1109.520 um
Proximity: 0.45073 mm
Contact:   -0.65879 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.661708
probe at 150.000,150.000 is z=-0.659208
probe at 150.000,150.000 is z=-0.655458
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=-0.627646
probe at 150.000,150.000 is z=-0.753583
probe at 150.000,150.000 is z=-0.706708

Delta:     -1152.807 um
Proximity: 0.44975 mm
Contact:   -0.70306 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.702333
probe at 150.000,150.000 is z=-0.703271
probe at 150.000,150.000 is z=-0.703583
probe at 150.000,150.000 is z=-0.718271

Delta:     -1115.480 um
Proximity: 0.44961 mm
Contact:   -0.66587 mm
Comparing @ 150.0000,150.0000
probe at 150.000,150.000 is z=-0.667021
probe at 150.000,150.000 is z=-0.662333
probe at 150.000,150.000 is z=-0.668271
Probe samples exceed tolerance. Retrying...
probe at 150.000,150.000 is z=-0.658583
probe at 150.000,150.000 is z=-0.670458
probe at 150.000,150.000 is z=-0.670146
probe at 150.000,150.000 is z=-0.662333
Now printing OK on the nylon bed. Not tried the PEI sheet yet.
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