So, I have an OX, with a Gradus M1 Pro controller, running GRBL 1.1. I have been having a frustrating problem calibrating the machine, and my googling abilities have failed me on this one. When setting the steps/mm, it seems to vary from small distances, like 50 mm or so, to larger, like 300 mm by almost a mm. According to the calculations on the belt/pulley, the setting for larger distances is a lot closer, and I have to increase the steps for the smaller distance to be correct. Aside from this issue, the machine is consistent, and pretty rigid. With the steppers locked, there is very little play to the spindle (definitely not a mm) Mathematically, the only reason I could imagine why I am having this problem, would be issues calculating acceleration, as a step should be a constant, but messing with that setting didn't change the situation. I cannot find anything about this, does anyone have any idea what might be going on?