NEW VERSION OF THE PUMP http://www.thingiverse.com/thing:642192 Improved, minimalistic peristaltic pump for I'm not sure what. BOM: Five M3x8mm screws Two M3x12mm screws Four 8mm OD, 3mm ID bearings One NEMA-17 Stepper Motor (at least 4 kg/cm) 2mm OD, 1mm ID soft silicon tubing1) Print one of each part 2) Screw bearings into the rotating hub and attach to the stepper motor 3) Sleeve tubing through the enclosure 4) Screw enclosure to motor 5) Attach tube clamp