Changelog
7/13/16 - New Roller Assemblies. No more motor mount flex, less hardware needed. More, mostly printed! New size added.
5/25/16 - New Center and Z Axis assemblies, More rigid!, easier to square, universal tool mount.
4/24/16 - New Corner assembly, easier to square, shorter print time, more rigid.

Mostly Printed CNC / MultiTool
These parts are for 23.5mm OD conduit.
25mm OD here-http://www.thingiverse.com/thing:790533
25.4mm OD here- http://www.thingiverse.com/thing:1671517

WE WON! Grand Prize winner!. Thank You all for the votes and cooperation.

Nice write up, explains this in more detail Here

I set out to build a minimal cost CNC Machine with the goal of some basic aluminum capabilities and easily multi function.

More info
http://www.vicious1.com/

Hardware and printed parts available here.
https://vicious1-com.myshopify.com/

Printing info
http://www.vicious1.com/blog/parts/

The only special tools needed are a hacksaw, and a drill to for 4 holes.

This can be easily expanded to almost any length, width, and depth depending on rigidity required. Shorter lengths = more rigid. This is built using hardware store emt conduit (In the US it is sold as 3/4" (ID)), or as an upgrade you can use stainless steel tubing.

Most woods and plastics should be no problem. I milled Aluminum with a footprint of 23.5in x 32in x 4in. Aluminum works well https://www.youtube.com/watch?v=GIYMuYgX0rY

You can switch the spindle out with a drag knife, laser, Extruder, ect, making it a great prototyping multi-tool. By adding length and depth It could easily be used to shape large easily milled things like wood, foam, or plastics. Keep it small for aluminum.