Firmware 1.1.9C - Bug / Error GRID_MAX_POINTS_X

AirBee

Hello , 

To find out what 's going wrong with my BlTouch settings on my A5 with 1.1.8,  I've decide to test 1.1.9c.
My problems are still there ;(

But I've notice that if you Set in AUTO_BED_LEVELING_UBL section  GRID_MAX_POINTS_X to a value (ie 7),
the G29 P1 do a mesh grid of GRID_MAX_POINTS_X - 2 ( ie 5)
and left a "big" margin whin no mesh ...

Samuel Pinches

Hi AirBee,

Welcome to the forum! And thanks for at least giving 1.1.9 a go. 

Maybe you would like to upload a zip of your marlin folder and we can take a look at your config?

Cheers,
Sam

AirBee

Hi Samuel,

I ve made modification in configuration.h and nowhere else.

May be something with even/odd max_point. 

For my problem, I ll post a "help me" later. 
It s something I try to figure out since 3 days , with no sleep ;(
I start a G29 P1 , save etc ... all seems good ... value are always in same "offset" relative value ... so I think the bltouch give correct value.
BUT , after that , if I activate and load the mesh for printing , something in my system and/or in UBL_motion.c give a tilt and crushed the left part of my bed ... always and always ... with g29 j or not ...
even if I go down abnormally the right of my bed, the ubl adjustment crushes on the left.
always about 0.20 mm ... the left incrust my tray and the right does not adhere ... (my new one , 2 days and now , I can see a beautiful draw with no more adhesion layer ... 

If I turn off UBL , and do a manual mesh , all goes right ... 
If I compare G29 P1 matrix to the manual matrix , it seems to be the same "proportions"
I ve take the value from the auto_ubl matrix and introduce them in manual mode ... ok .. it works ... but it s not really 
really user friendly lol


Cheers,
Cedric.

coffeeroast

Hello AirBee,

is that the working configuration.h for the Bltouch?

I also wanted to install a Bltouch tomorrow. :-) That would be fitting.

greetings
Reinhard

Samuel Pinches

Hi @AirBee, I had a look at your configuration. Have you set the z probe offset correctly? Line 799:

#define Z_PROBE_OFFSET_FROM_EXTRUDER -0.95   // Z offset: -below +above  [the nozzle]

Try changing the offset and see if that helps. Also, what fade height are you using?

AirBee

coffeeroast : yes and NO , I've problem.

@Samuel : yes this offset is correct and offset is not the problem.


1) "bug" in 1.1.9c : if you set max x point to a value , g29 P1 generate a matrix with x * x point (G29 P1 T) ... 
but : NERVER , really never go and check row 0, line 0 , row (x-1) , line (x-1) 
in my case , it let a "margin" of more than 50 mm alll around my bed.
I have to add ma ally or G29 P3 to complete matrix.
in the same moment , if my head goes somewhere out of mesh (see from the code in firmware , not the reality) ... my head goes up (I think 2.5 mm ) even if I turn off or set or changer #define UBL_Z_RAISE_WHEN_OFF_MESH

those bug , are  NOT in 1.1.8 (maybe due to the change to "Float" decoration all around the code ..). (sorry ... my English is hmmmm ... n o comment my code is better than my English ...

sample 

 #define MESH_INSET 15              // Set Mesh bounds as an inset region of the bed

  #define GRID_MAX_POINTS_X 10     // Don't use more than 15 points per axis, implementation limited.

  #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X

G29 T (P1 done with bed set for test 3 or 4 mm left higher) 

       0       1       2       3       4       5       6       7       8       9

 

9 |   .       .       .       .       .       .       .       .       .       .

   |

 8 |   .     +1.013  +0.665  +0.392  +0.109  -0.191  -0.495  -0.768  -1.038  .

   |

 7 |   .     +1.098  +0.772  +0.439  +0.139  -0.172  -0.443  -0.727  -1.028  .

   |

 6 |   .     +1.160  +0.810  +0.469  +0.146  -0.152  -0.441  -0.725  -0.991  .

   |

 5 |   .     +1.203  +0.835  +0.490  +0.163  -0.144  -0.432  -0.725  -0.994  .

   |

 4 |   .     +1.219  +0.850  +0.514  +0.170  -0.124  -0.420  -0.728  -1.030  .

   |

 3 |   .     +1.241  +0.868  +0.514 [+0.199] -0.125  -0.448  -0.740  -1.004  .

   |

 2 |   .     +1.250  +0.872  +0.540  +0.189  -0.144  -0.458  -0.764  -1.034  .

   |

 1 |   .     +1.238  +0.861  +0.480  +0.150  -0.180  -0.487  -0.750  -1.041  .

   |

 0 |   .       .       .       .       .       .       .       .       .       .

        0       1       2       3       4       5       6       7       8       9

    ( 15, 15)                                                              (289, 15)

2) my problem , with 1.1.8 or 1.1.9c ... : blotch seems not working ...
after levering, activate ... left print crushed bed  , right print are "far" away from bed ... ALWAYS.

i ve made some "test" ...
I "adjust" my bed manualy with left 5 mm higher than right
start g29 p1 .. save etc ...

move the head around the bed with code and g29 activate and load , "seems" ok .. my head follow my bed with the "Good" variation ....

BUT , again the same "abnormal " z position ... left nozzle position is about 0.1/0.2 mm lower Thant right ...

if I move my bed right upper of 5mm than left ..
do all the procedure again ...
test ...
and left nozzle position is about 0./0.2 mm lower thant right.

i have change bed glass, axe , bearing , motors , steppers .. and and and. ...
I decide to go and look firmware code .. ok ... If it s there . I don have now the solution ... but if it s a "mathematical"/software  error ... not hardware.
 

ps : i ve test , fade height , z offset (m851) , zh offset (g92) ...and and and and ... 

ps2 : hot bed or not

ps3 : if I use my jauge (https://www.amazon.fr/gp/product/B01H035DRO/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1) and manualy check et verify , axe move etc are correct without ubl correction ...left / right move up /down at the same "rate" etc ...

ps4 : G29 J ... no change to my problem