Topics created by Willo47

@Willo47 said in Mesh bed compensation:

When I probe at the extremities is where I get different Z probe heights. The probe heights are identical with mesh bed leveling on or off.

This isn't something that mesh compensation can solve. It sounds like you have some gantry sag. The compensation assumes that the XY gantry is flat over the entire area. You'd have to manually do G30 S-1 in a grid across the bed to map out what the variation is.

@willo47 which M581 code references are you referring to?

@Willo47 I can see that a dial gauge would be helpful with 9 points 😮 Sounds like good engineering!

@Willo47 said in Solutions to Core XY printer success:

The live Z for tuning first layer height which is available on the Prusa Original MK3 is not available on RepRap firmware. Baby stepping implemented on the DWC does not seem to work. Here is my solution :
Using M206 does change the end stop ie M206 Z0.05 effectively moves the bed coordinates to lower the extruder head. If you want to lower further you need M206 Z0.10 and so on . I have made a series of macros to move the head up and down. I have made a simple square print to fine tune my Z height. Once OK I send a M500 to store it in EEPROM. In my print start up code I use M501 to read the value back. If you use mesh bed compensation the M206 commands seem to have no effect during the print so I do my tuning prior to printing. Once tuned the setting seems to remain OK.

Baby stepping does work, but it respects the M208 limits. So if you set the M208 Z min to 0 then you can't babystep down by more than the first layer height.

It's common to home using the Z probe; in which case fine adjustment to the Z=0 position is done using the G31 Z parameter.