Needed a micro-liter syringe pump to deliver antibodies for a 3D printed auto-immunostainer. Works like a charm! Youtube video: http://youtu.be/YYr7mdXrpd4 For use with 2 mm (3D printed) maker-beams and connectors, see my other project for other connectors Length of makerbeam bed is 12cm. http://www.thingiverse.com/thing:28179 Designed in trueSpace and printed on an Up3D in ABS at normal resolution. I used PM42L-o48-17 steppers with a Phidgets four unipolar motor controller and Labview for the interface. Give microliter control with essentially an no backlash. I used two nuts in the driver head with slurry paste. Standard threaded rod for drive screw.