I built this for fun, originally, but it worked out well that I now use it automate drilling PCBs. Utilizes my CNC Driver.
The design is inspired/based off of this Instructable
Built from things on hand, or easily available from a local hardware store. Pretty much a 2x4 frame, with the moving parts made out of aluminium U channel. The X and Y steppers were pulled from 2 identical scanners, the Z was pulled from a printer. All 3 were scavenged. I built it for pretty much free.
Its taken a lot of work to get it to function correctly. But I've got it working quite well.