Configuring an H-bot printer
This feels silly, because I've had this printer for years and run something like 20kg through it just accepting that it was never quite 'spot on'.
However I just really had a realization that adjusting the x/y steps does not actually account for differences in step distance, and instead is likely resulting in some skewed prints (I've now done a significant amount of other upgrades which have removed various other 'build noise' inherit in the printer (ender-4)).
For core-xy you 'configure' this by varying belt tension (and thus the effective steps/mm), then you calibrate x/y in software normally[1].
However- since its H-bot and not core-xy I realize I have no idea how I'm supposed to account for steps/mm differences from the motors? Is it a marlin command I can push?
This is my current marlin adjustment push which does get me spot on X and Y dimensions, but does not account for oval prints and skewed angles on squares (and I'm now starting to think that it may actually be making it worse)M92 X80.499 Y79.602 Z400.00 E86.8834 -- obviously the Z and the E can stay, but is there another command to change A/B instead of X/Y, is this instead a matter of adjusting the angle of the H-cross (using the H-cross bar to adjust for motor variance)?
Posted Jun 17, 2020, 2:25 PM UTC · edited