I posted about this a year ago, and due to life being life, I am just getting back to this project now. My Z axis motor doesn't seem to move at all, and the X axis sounds like it's just skipping and it isn't moving. It's been a frustrating project, honestly. I have the Y axis moving appropriately, so I don't know why the other two won't move. Also, the extruder won't seem to take the filament into the hotend so there's no extrusion either.
Effectively i've been a quarter of a printer, and I'm banging my head against the wall to figure this out. I'm sure it's simple enough, but it escapes me at the moment. I was also getting an odd (to me) display showing 0 or ? for the axis positioning. I've attached images, maybe they'll mean something to someone.