Welcome to the SeeMeCNC Community

Hello everybody,

For my new Rostock Max (first printer!), after much trial and error, I am stumped and would appreciate any help!

My X-Y movement and Z movement are not scaling correctly. I first began comparing the actual movement of the head vs what I tell it to move in Repetier. For example, I would set it at Z5 Y80, zero in the y azis with a pair of calipers, tell it to move to Z5 Y50, and compare the actual to theoretical movement. The computer says that it moved 30mm, while the calipers measured 45mm. I adjusted the motors and now the XY movement is exact, except it screws up the Z movement.

If the XY movement ratio is 1:1, then the Z axis is at about 1:0.6 (theoretical:actual)
If i adjust the Z axis to 1:1, then the XY is about 1:1.4

I am running Polygonhell's firmware.

Any direction or help would be appreciated! Thanks!

Not sure is this is your issue since it seems like it should affect all three axes, but do you have a newer machine with the 20 tooth plastic timing pulleys on the steppers? If so, you should make sure your Configuration.h file has
#define PULLEY_TEETH 20
and not 15

Oh thanks! I forgot to change that. Would changing the steps/mm motor settings be equivalent to changing that though? Or would that bypass cause additional problems?

Yes, they are both related, but there was just a post that the correct steps/mm should be set in BOTH the EEPROM and configuration.h. Apparently the configuration.h setting affects the Delta motion, which could be your problem. And PULLEY_TEETH controls the effective steps/mm in the configuration.h, so it could affect the delta motion as well. See Polygonhell's post:
http://forum.seemecnc.com/viewtopic.php ... 7&start=10
-B