So, you have a CNC laser cutter but you want a CNC mill? Problem solved.
This project is a small CNC mill that can be assembled from store-bought and laser-cut parts for about $800 without machine tools. (If you have access to a shop with a chop saw and a drill press that'll be helpful, but you can get by with a hacksaw and some wrenches.) As pictured it has about a 4" x 6" x 1.5" working volume, but it can easily be expanded and modified.
The killer app for this is making custom printed circuit boards. But it can also make plastic and wood machine parts (including all its own parts), mill custom aluminum instrument panels, create stencils, and make artistic etchings for print-making.
I've included both Adobe Illustrator and Autocad DXF files for the custom parts, as well as an Arduino sketch for controlling the brushless motor.
(1) Setting expectations, and words of caution
(2) Buy parts and find tools
(3) Laser cut the custom parts
(4) Assemble the Z-axis and spindle
(5) Assemble the X-axis carriage
(6) Assemble the Y-axis and bed
(7) Assemble the frame
(8) Wire it up
(9) Tuning, tweaking, and milling tips
(10) Software you may find useful