@gloomyandy said in Tracking down first layer inconsistencies:
@Exerqtor What are the two trigger heights that you end up with (so the one you may have set from your config and the one that results with G30 S-3)?
I haven't got any real numbers for that atm. but they're usually NOT the same. (I've got the M501 at the end of config.g and have the probe offsets stored in config-override.g). So that's why i'm suspecting this to be the cause of issue.
Also how are you setting Z=0? I've always found that it is important to ensure that it is set using the same mechanism that you are using to create the mesh. Ideally the mesh should contain the same point that you "probe" to set Z=0 and you should be able to then check that this point in the mesh is indeed 0 (or very, very close to it).
I'm setting Z=0 with the homez.g as part of G28 before mesh.g gets ran. And homez.g allways probes the bed center,
Maybe i should change the routine in mesh.g to probe Z=0 in the middle of the probe/print area instead of the trigger height lol. So that it's referenced of that instead.
EDIT:
I just found an mechanical issue too, the magnets for the TAP carrier had come undone.
They're now been glued in place with CA-glue and the Z-offset adjusted.
Best practice regarding the previous question still stands though. I feel like setting Z=0 in X/Y center of the area to probe sounds like a better idea than setting the trigger height.