Hi,

My duet wifi will only calibrate up to 0.108 accuracy and if I then look at M665 values, arm length is way off showing 223 whereas the actual length is 215.

I have a kossel mini with linear guides and ir sensor in the effector.

Also my mesh leveling is erratic at best, but is very accurate if I run the mesh leveling with same settings twice.

I really have no idea what I'm doing wrong anymore.. Delta's geometric values are within tolerances. Anyone familiar with these weird results and able to help?

i think i solved it...

any black surface makes the ir sensor useless. i purchased white buildtak and all my problems are gone.

i tried:

black spraypaint
easy peelzy
black buildtak
black pei
all the above with glass

nothing worked

regards and thanks

The ir sensor is the one sold on 1233d.nl. This one does not seem to be the same one sold on duet3d.com (picture looks different). I've ordered the one from duet3d and hope that one will work better, as even on the white PEI sheet, the results fluctuate.

i think i solved it...

any black surface makes the ir sensor useless. i purchased white buildtak and all my problems are gone.

i tried:

black spraypaint
easy peelzy
black buildtak
black pei
all the above with glass

nothing worked

regards and thanks

I have tried on easy peelzy but getting similar results as the first heightmap.

I just replaced my IR sensor this weekend, but does not show any changes in results.

Hi, I was using aluminium printbed coated with black spray paint on the first heightmap. On the second run I put a borosilicate glass surface on top of the painted surface without any coating.

0_1538383946241_heightmap_glass.csv

This was run with following settings:

; Z-Probe
M558 P1 H20 A1 F200 T2000 ; Set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z-1.73 ; Set Z probe trigger value, offset and trigger height
M557 R75 S10 ; Define mesh grid

@dc42 said in DuetWifi Delta calibration and mesh issues:

load your height maps exactly as they come downloaded from the Duet, not re-exported from Excel.

Okay, over the weekend I took the whole thing apart and rebuilt the printer using as low tolerances as possible (replaced on linear rail, added extra supports in the corners etc..). I'm running a separate cable to the IR sensor to remove any potential static. Attached the resulting height map on a surface that is not entirely flat, but not as bad as the height map shows. I'll also attach the height map ran on a glas surface.
Settings used for this heightmap:
; Z-Probe
M558 P1 H8 A2 F200 T2000 ; Set Z probe type to unmodulated and the dive height + speeds
G31 P500 X0 Y0 Z-1.73 ; Set Z probe trigger value, offset and trigger height
M557 R75 S10 ; Define mesh grid

bed.g:
M561 ; clear any bed transform, otherwise homing may be at the wrong height
G31 X0 Y0 ; don't want any probe offset for this
G28 ; home the printer
G30 P0 X-73.6 Y-42.5 Z-99999 ; X tower
G30 P1 X0 Y-75 Z-99999 ; between X and Y towers
G30 P2 X73.6 Y-42.5 Z-99999 ; Y tower
G30 P3 X73.6 Y20 Z-99999 ; between Y and Z towers
G30 P4 X0 Y75 Z-99999 ; Z tower
G30 P5 X-73.6 Y20 Z-99999 ; between Z and X towers
G30 P6 X-36.8 Y-21.25 Z-99999 ; half way to X tower
G30 P7 X36.8 Y-21.25 Z-99999 ; half way to Y tower
G30 P8 X0 Y42.5 Z-99999 ; half way to Z tower
G30 P9 X0 Y0 Z-99999 S6 ; centre, and auto-calibrate 6 factors

0_1538381259384_heightmap.csv

does this help?

drives me nuts, i am trying everything but at the brink of just giving up, don't know what else i can do

0_1537778478871_heightmap.xlsx

[0_1537778406100_heightmap.csv](Uploading 100%)

Calibration results:

Calibrated 6 factors using 10 points, deviation before 0.091 after 0.080