Printrbot and Wallace Z axis stabiliser
by aliekens, published
Stabilizes potential wobble in Z axis rods.
Print two of these, add 608 bearings, fit a rod and mount on top of the vertical rods. The thing assumes the screw and smooth rods are about the same height (driver rod may be about 5mm higher. This is not to be used as a handle as it is loosely installed on top of the Z axes.