Mesh Bed Compensation Limit

kaoshihchuan

Hi Experts,

I have couple questions regarding mesh bed compensation. For my printer, I have an external optical sensor to measure the bed topography. Therefore I generated my own heightmap file from the data given by that sensor.

What is the maximum amount of points/grid size I can use ? I have tested a 26x26 heightmap csv file but it complains about the wrong grid format. But it's fine for a 21x21 grid.
Is there any limitation for bed compensation ? In my heightmap file, the min error is -1.5 and max error is about 0.45. After applying this file, the result with compensation shows the min error is -0.8 and max error is 0.05 ( I re-measured the bed topology with mesh bed compensation enable). So I still got about -0.8 mm lower at that tilted corner with mesh bed compensation on.

Thanks !
Kevin

Phaedrux

See here: https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

You can have a max of 441 points.

How are you defining the Z0 point? The firmware will display the heightmap in reference to how Z0 was set.