Customizable Replicator Dual 5mm Drive Blocks

This is a revised drive block derived from http://www.thingiverse.com/thing:53125
I used OpenSCAD to mirror the STL files after I resaved them from Meshlab. They wouldn't load correctly before. I changed the size of the bearing axle to accomodate a 5x10x4mm bearing that is easily available from any hobby shop that carries 1/10th scale cars. I made the pivot screw hole slightly larger, and shaved off the top of the lever to fit in the replicator 1. There are mirrored versions for the left ex