Just like the MPCNC, the Piper uses sets of 608 skate bearings in a “Y” configuration to ride on the EMT rather than the linear bearings you would expect on a more traditional 3D printer.

The Mostly Printed CNC (MPCNC) is an impressive project in its own right, allowing anyone with a 3D printer and some electrical conduit to build their own fairly heavy-duty CNC platform perfect ...