I am building a delta printer (a modified/re-designed Kossel mini) and this is my effector design, which is based on the different ones already out there. My goal was to make it compact and good-looking, and with magnetic joints for minimal backlash. Here is the complete printer: http://www.thingiverse.com/thing:923830I printed in PLA, but ABS is preferred. I would also recommend something like 0.15-0.2 layer height and 100% infill. Parts required: 1x 30mm fan