He’s eschewed a router or extruder, and instead fit an off-the-shelf CNC machine kit with a sandblaster. If you are used to a sandblaster as a means for removing rust from pieces of your motor ...
For more inexpensive MDF-based CNC machines, check out this drawer slide bearing one or this one that uses a drill for a spindle.
Compact yet powerful, this machine suits beginners and experienced users and offers pro-level features that make it ideal for small-scale CNC projects.