About this 3D model

This thing is a Derivative of http://www.instructables.com/id/Easy-to-Build-Desk-Top-3-Axis-CNC-Milling-Machine/I really wanted a printable cnc machine, there was an incomplete one around but was removed.So I used a frame of my old and poorly made cnc machine i had, and desgined this thing wich so far shows promising results.There are few insprations from prusa, that is the bushing and the anti backlash nut.the new design allows a much bigger build area, the motors got an upgrade so will the drivers.as for the z axis im using a big stepper (look like a nema23 but im not sure exacly what is it got it from a printer) with a good lead screw i had around.