The Shapeoko2 shipped with an Altocraft spindle in December. On the stock spindle mount the rotary tool slams the top of the z-axis bracket reducing the ability to raise the carriage too high.
This mount add-on pushes the tool out providing clearance at the top of the z-axis and also aligns the tool vertically with it's taper.
Initially printed at 20% infill and .3mm layer height to reduce prototyping print time. Over tightening the bolts could cause crushing issues, so if printed for longer term use, I would print at least 90% infill.
The top mount uses the bolts that came for the mount.
The bottom mount uses M5x30mm bolts to mount it to the original aluminum mount.
The bottom mount uses a capture nut and a M3x30mm bolt through the base for the cap. A shorter bolt could be used. Anything longer than 30mm will hit the back of the mount.
** Depending on how deep you are milling into your work, you may need to adjust your z-axis rail assembly lower on the sub gantry to bring your tool closer to the MDF board. I was able to make this adjustment after everything was assembled.