About this 3D model
The people of Ufactory were kind enough to publish their robot arm design as a STEP file on grabcad.com. However, STEP files do not easily translate to the laser cutter. For that reason, I recreated the design in solidworks and exported the vector files to make it easier for those who wish to make their own U-arm. Note that the parts that have a tiny red G on them are for the gripper assembly. For detailed assembly instructions, please go here: http://blog.ufactory.cc/assembly-diagram-of-uarm/