Mesh bed compensation

[fcwilt]

@heide

Your probe X offset from G31 is specified as 100 . You have to take that into account when specifying where to probe.

Your axis X min value from M208 is specified as 0.

Your probing grid X min value from M557 is specified as 15.

To move the probe to X = 15 means moving the nozzle to X = -85, which is not possible given the X min value from M208.

Is your probe really 100mm to the right of the nozzle? That is a very large value.

Frederick

[Heide]

@fcwilt No the probe is not 100 mm. from the nozzle. I have now changes that to x = 15 mm, and Y = 20 mm. Is it very importent that it is precise?
It is some confusing with the + and the -.

I have now altered the coordinates, and will start it up again, to see if that helped

[Heide]

@fcwilt When you read the hightmap, is the numbers off or is it normal?

[fcwilt]

@heide said in Mesh bed compensation:

Is it very importent that it is precise?

It should be easy to get within a mm or two.

It is some confusing with the + and the -.

Assuming X increases as you move to the right and Y increases as you move to the rear:

For X, + is to the right of the nozzle, - is to the left.

For Y, + is to the rear of the nozzle, - is to the front.

Frederick

[fcwilt]

@heide said in Mesh bed compensation:

@fcwilt When you read the hightmap, is the numbers off or is it normal?

Hard to tell with an incomplete height map.

If you post your actual height map file (the .CSV file) we can load it and look at the 3D image.

Or you can take a screen shot of the 3D image and post that.

Frederick

[Heide]

@fcwilt here it is

I still need some tweeking, but almost complete. I will make a new one tomorrow. I will adjust accoring to your explanation. Thanks

RepRapFirmware height map file v2 generated at 2022-04-04 20:58, min error -0.880, max error 2.263, mean 0.810, deviation 0.709
axis0,axis1,min0,max0,min1,max1,radius,spacing0,spacing1,num0,num1
X,Y,0.00,270.00,0.00,240.00,-1.00,20.00,20.00,14,13
      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0,      0
      0,  2.263,  2.043,  1.743,  1.447,  1.213,  0.913,  0.627,  0.383,  0.125, -0.110, -0.465, -0.785, -0.880
      0,  2.207,  1.983,  1.760,  1.435,  1.195,  0.965,  0.688,  0.438,  0.215, -0.005, -0.305, -0.615, -0.757
      0,  2.155,  1.950,  1.703,  1.398,  1.205,  0.980,  0.735,  0.490,  0.260,  0.075, -0.235, -0.510, -0.667
      0,  2.078,  1.885,  1.642,  1.388,  1.160,  0.978,  0.765,  0.518,  0.323,  0.178, -0.145, -0.397, -0.525
      0,  1.983,  1.820,  1.628,  1.388,  1.205,  1.015,  0.785,  0.562,  0.390,  0.235, -0.027, -0.300, -0.428
      0,  1.945,  1.780,  1.553,  1.375,  1.215,  1.005,  0.825,  0.615,  0.420,  0.268, -0.027, -0.207, -0.342
      0,  1.855,  1.693,  1.540,  1.308,  1.148,  0.993,  0.843,  0.655,  0.500,  0.358,  0.103, -0.075, -0.182
      0,  1.767,  1.648,  1.470,  1.305,  1.148,  1.040,  0.892,  0.735,  0.582,  0.442,  0.255,  0.068, -0.055
      0,  1.668,  1.575,  1.443,  1.257,  1.160,  1.030,  0.895,  0.763,  0.625,  0.510,  0.345,  0.173,  0.058
      0,  1.580,  1.485,  1.355,  1.240,  1.130,  1.013,  0.885,  0.765,  0.648,  0.543,  0.405,  0.245,  0.175
      0,  1.513,  1.425,  1.320,  1.210,  1.105,  1.005,  0.898,  0.793,  0.690,  0.610,  0.490,  0.350,  0.295
      0,  1.425,  1.358,  1.263,  1.168,  1.092,  1.005,  0.910,  0.815,  0.730,  0.663,  0.567,  0.447,  0.408

[fcwilt]

@heide

What sort of printer do you have?

The numbers suggest the bed is not level.

Usually you want to level the bed as best as possible and only rely on mesh bed compensation to deal with bed irregularities.

Frederick

[Heide]

@fcwilt It is a Voron 2.4

[fcwilt]

@heide

It appears to have bed leveling adjusters.

Have you tried to level the bed using them?

Frederick

[Heide]

@fcwilt There are no adjusters. But I kan dissasemble the bed and adjust with shims. I have done that a couple of times. But it seems that I didn't take the Gantry in count. It also needs to be levelled. Or mayby I misunderstand that. I have browsed the internet, and I still needs to read up on the method, to figure out how to get the gantry to be even. I would like to at a tight setup, with no compensation, but that must be in a dream world I will hit the sheets now, and get back tomorrow

[Heide]

@fcwilt I have now adjusted the config.g and it works. I stille need to level the bed by hand, but that must be later on.

Please mark it as solved and thank you very much for your help

[fcwilt]

@heide said in Mesh bed compensation:

@fcwilt I have now adjusted the config.g and it works. I stille need to level the bed by hand, but that must be later on.

Please mark it as solved and thank you very much for your help

Glad to hear you got it working and I am glad I was able to help.

Frederick