Joint of 3 degrees of freedom

thingiverse

A 3DOF miniature joint based o two 13x4x5 bearings and two 6x12x4.5 thrust bearings. Model uses M4 bolts for axes, M3 and M2 assembly bolts for assembly and anisotropicity Z pinning. There are bearing variants for 13.1 and 13.5 to compensate for eventual hole shrinking during printing. The inset expander piece goes into an armature tube and is fixed shut by screwing in the axis bolt, which also has a friction nut on that keeps the thrust bearings squeezed into the runner tracks. A generic attachment piece at the end of the joint, for fixening to something mobile. Two washers go inbetween the two parallel attach point bearings. A bearing between bearing and center piece should also help mechanical stability, for plastic material. Low polygon model with full assembly also provided. Photos are of a slightly different version.