I’ve barely even started printing, but I got an idea in my head looking at the design and thinking about 4 axis milling… The really neat thing about this design (besides the emphasis on inexpensive parts) is the gantry. I don’t know of another CNC design that directly supports the tool head in both X and Y direction. Anyway, my (probably terrible idea) is this:
Use the gantry design of the MPCNC, but instead of having the tool head on the gantry, have the cut table mounted upside down on 2 rails in direction. Use a Z axis on a fixed base underneath the gantry, with 2 Z motors. Raising only lead screw will change the angle of the tool head, allowing for diagonal cuts in rough 45 to 135 degrees (an entirely new Z design would be needed to allow this). Your cut area would only be 1/4 the size of the gantry, but it seems like it could be incredibly rigid and allow for true 4 (or even 5) axis milling. Plus cleanup is a breeze since all the dust just falls down.
I’m sure I’m missing some very good reasons why this wouldn’t work… Thoughts?