Confused about UBL

Hi,

I have read the excellent documentation on UBL and created mesh, done a test print and everything looks perfect!

My mesh is now loaded but this is where I get confused. Should UBL do a test probe in 3 places to verify the mesh tilt? I have added G28 to my startup script but it just homes all axis and goes on to print.

Am I missing something? It's nice having a topology of my bed but not very practical if it can't tilt this mesh if my bed gets knocked slightly.

Apologies if I have missed something....

Quote
totalitarian
It's nice having a topology of my bed but not very practical if it can't tilt this mesh if my bed gets knocked slightly.

Apologies if I have missed something....

If your printer drops off the table and falls on the floor. It only takes 15 or 20 minutes to generate a very well tuned mesh with UBL.

Edited 1 time(s). Last edit at 10/03/2017 11:06PM by Roxy.

Quote
Roxy

Quote
totalitarian
It's nice having a topology of my bed but not very practical if it can't tilt this mesh if my bed gets knocked slightly.

Apologies if I have missed something....

If your printer drops off the table and falls on the floor. It only takes 15 or 20 minutes to generate a very well tuned mesh with UBL.

True but a quick probe scan to check everything is as it should be would great. This way I can do a 15 x 15 mesh for accuracy and a quick 3 point before every print. Is that possible?

Yes. But probably a 3x3 grid would make more sense. But my guess is just the normal mesh is going to work fine.

I thought you only need 3 points for a plane to determine tilt?

Yes. But remember there is some amount of error in any sampled point. And even with 3 points spread as far as possible in each corner leaves one corner pretty far from any of the 3 points.

3-Point leveling was the very first leveling system. It definitely helped. But the grid based leveling does a better job.