Fantastic! You hit the nail! I was wrong in assuming that the DRV8825 was the original driver ic.

Originally the anycubic i3 mega has the A4988 drivers, which can be verified on http://thingiverse.com/groups/anycub...al/topic:27064

This also means that the correct way to handle the DRV8825 driver is to build the application from scratch with using the correct define from above. The M92 command from above also works but is a workaround for this.

Thanks!