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Homebrew engraver to 3D printer Mod

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BillTodd:
Thanks.

Just tried UBL with a 3 x 3 mesh and...

Zilch

My probe off-set is -5.4 which homes perfectly to 0.00 at bed centre.

G29 P1 T prints a nice couple of  nice 'maps'  with only the home position dimensioned at -4.995  then  stops at the second  2/9  spot with [ ] and prints ok as if finished


If I try to use the LCD and spinwheel : It lowers the Z to 0.000 which is actually about 3mm about the bed , after winding the knob down 3000 um (WFT is the res so fine?)  on each of the nine positions the F*********** starts over again and get caught in a loop : :doh:

Tried again with a 3x4 mesh and got two measurements (apparently , iit does not probe points it cannot get to - whatever that means) , third try with 5x7 mesh...

BillTodd:
OK I kinda see wahts happening here, although the Z height thing is confusing.

It is missing all points on the periphery because they are inaccessible (must be something to do with probe off-set but????)

My 5x7 resulted in:

    (  5,235)                      (115,235)
        0       1       2       3       4     
 6 |   .       .       .       .       .   
   |
 5 |   .     -4.950  -4.980 [-4.965]   .   
   |
 4 |   .     -4.945  -4.995  -4.990    .   
   |
 3 |   .     -4.945  -4.915  -4.985    .   
   |
 2 |   .     -4.980  -4.955  -4.880    .   
   |
 1 |   .     -4.995  -4.990  -4.980    .   
   |
 0 |   .       .       .       .       .   
        0       1       2       3       4     
    (  5,  5)                      (115,  5)

which looks consistent, but I don't think it actually touched down on any of those points . Aha It drops close to bed with probe retracted and them extends probe to test , then does a proper touch later.

I do not understand why the reference is about -5,although I believe I set the min_Z to -5.0.

The Z homes to +5.4 and BED top is actually Z=0.00   

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