HollowCNC - MPCNC

Hollow CNC - Mostly Printed CNC inspired by Dremel CNC

It was an attempt to improve rigidity for Dremel CNC by doing following:
* adding additional 12mm rods to Y axis,
* moving spindle as close to X axis as possible to reduce lever arm,
* making orifices in parts (therefore "hollow" :) ) to increase number of walls in 3d printed parts and make them more rigid.

Rough list of hardware used:
* 12mm steel rods with linear bearings for Y axis,
* 12mm steel rods with linear bearings for X axis,
* 12mm and 8mm steel rods with linear bearings for Z axis,
* 4xT8 rods with rigid motor couplers,
* 4 NEMA17 stepper motors,
* 3 microswitches as endstops,
* Arduino with CNC Shield to control the motion,
* ATX power supply to power controller and stepper motors,
* spindle controlled by external power supply,
* acrylic or other sheet to keep dust/chips from Y rods,
* various M3, M5 bolts mostly screwed directly into plastic parts.

Link to original onshape CAD:
https://cad.onshape.com/documents/bf0