*"Right_Arm2_No ...support.stl" and "Left_Arm2_No support.stl" are must print without supports.
*No extra parts needed, which are can't make with 3D printer such as metallic springs, bolts and etc.
*The parts are designed and tested to fit each other, however the tolerance is depends on a 3d-printer's condition.
Please remove the supports completely. May need a sandpaper or cutter while assemble the parts.
Use a raw 1.75mm filament and super glue while assemble the parts.