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Marlin 1.1.4 UBL issue

Posted by tow 
tow
Marlin 1.1.4 UBL issue
September 01, 2017 09:38PM
Hello, im trying to configure UBL on my Sunhokey I3 with capacitive probe connected to z- min endstop
G28 works as expected.
I have 3X3 mesh set in FW.
I'm following [marlinfw.org] for setup.
The first phase 'G29 P1' ends up with the following points probed (X- probed/Y-not probed):
YYY
XXX
XXX

all offsets reported by 'G29 T' are between 0.7 and -1.2
The second phase 'G29 P2' (manual) my offsets are huge -3.1 and -1.7
Now, when i try to print test patter with G26, the manual points are printed OK but the auto-probed point are far away from the bed, in the air (about 3-4 mm from the bed).

Does anyone have a clue why auto probed points printed in the air?

Recv: (0,2)           (2,2)
Recv: (15,183)        (185,183)
Recv:  -3.150   -2.330  [-1.710]
Recv: 
Recv:  -0.699    0.136    0.759
Recv: 
Recv:  -1.229   -0.399    0.291
Recv: (15,15)            (185,15)
Recv: (0,0)             (2,0)

If i try to fine tune the auto-probed point with 'G29 P4 T' , i get huge offsets that do not make any sence . its like there is some sort of offset applied :
im bellow map , i manually tuned the bottom left auto-probed point

Recv: (0,2)           (2,2)
Recv: (15,183)        (185,183)
Recv:  -3.150   -2.330   -1.710
Recv: 
Recv:  -0.699    0.136    0.759
Recv: 
Recv: [-7.080]  -0.399    0.291
Recv: (15,15)            (185,15)
Recv: (0,0)             (2,0)

Edited 2 time(s). Last edit at 09/01/2017 09:46PM by tow.
Re: Marlin 1.1.4 UBL issue
September 09, 2017 09:49AM
First... a 3 x 3 mesh is not going to offer much accuracy. Really... you should consider going with a 10 x 10 mesh.

Second.... It is very important that you have your printer setup correctly to print a small object in the center of the bed with no bed leveling active. Please make sure you can do that.
It is much easier to diagnose and correct setup problems with any bed leveling active. But later... It is much easier to figure out and resolve any bed leveling issues if the base configuration is working correctly.

Once you get a small object to print in the center of the bed with no bed leveling active... I can help you get the rest of the UBL system going.
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