Mecanum wheel D=82mm H=42mm N=7pcs

## Parts/Wheel:
* 7 pcs M5 threaded rod (length?)
* 7 pcs 3D printed rollers `mw_r.stl`
* 14 pcs MR105ZZ-ball-bearing
*
* 2 pcs M3 screw (length?)
* 1 pcs M4 screw (length?)
* 1 pcs 4mm Shaft Motor Coupling
* 1 pcs 3D printed inner wheel `mw_ia.stl` or `mw_ib.stl`
* 1 pcs 3D printed outer wheel `mw_oa.stl` or `mw_ob.stl`

## Construction
* Use a saw to cut a slot on the M5 threaded rod so a flat-blade screwdriver can be used.
* Attach all rollers.
* Tighten the inner and outer whee