About this 3D model

This is part 3 of "Pimp my MakerBot" (see http://www.thingiverse.com/thing:973 and http://www.thingiverse.com/thing:958 for part 1 & 2 :) I was tired of dragging on the Z belt multiple times to upper or lower the z stage of my MakerBot. With this crank mounted on one of the 4 M6 threaded rods, I can now easily adjust the height of my MakerBot.