This could be a fun CNC to build with kids

Nice write-up and sourcing of materials to build a rather good looking CNC.  You need a 3D printer to print most of the connectors, and the “sides” will set you back $70 to have cut.  If I total it all up, maybe 250 dollars in parts?  Could be something fun to make with kids.  Too bad the author didn’t have a source for the 3D parts too.

http://www.instructables.com/id/3D-printed-CNC-mill/