This is a CIM motor setup as a DC servo for a large-scale 3d printer I’m working on at the University of Arizona College of Architecture. The CIM, US Digital encoder and GeckoDrive servo driver just arrived in the mail a few days ago and I finally had a chance to try them out. Needless to say, the precision is fantastic - I never knew a CIM could move so smoothly (good robo-pickup line).
The printer itself is designed to print a concretious material (currently looking into fiberglass reinforced concrete). The print bed is roughly a square meter at the base with about .5 to .75 meters of vertical travel. We purchased the GeckoDrive and CIMs for the x- and y-axis after we hit the physical limitations of the 250oz-in steppers origonally used.
(I do not endorce duct tape encoder mounting method.)