While searching for controller code samples came across this very kewl site. From its intro:

The OpenMoco system is an open-source software and hardware motion control system for time-lapse photographers and videographers. We also strive to provide an open environment for the photographic community to discuss all types of motion control and contribute free and open software and hardware designs for all types of photography.

jump there using this

One of my favored spots has become populated by working goats. I stopped by this morning just to get a few snapshots of them. Google has “hired” the goats to clear fields on the campus. The herd is big and very friendly. Many a cybersnap was being clicked by fathers with children.

see this for a homebrew continuous ink system… could save you $150.