improved version of the uStepper robot arm. Can be used with the original uStepper but also any other NEMA17 motors and control boards.
See http://marcuswolschon.blogspot.de/2016/03/building-ustepper-robot-arm-rev-2.html for details about the improvements.
THIS IS WORK IN PROGRESS
uStepper by ON Development is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
I've Changed the SCAD files for the gears to generate ssmall gear STL's that are compatible with a 4mm stepper moter shaft.