About this 3D model

This is a parametric knob with hole cover and latch. The latch is meant to hold a door or drawer from the back so it doesn't pull out or open. The latch is engaged or released by turning the knob. It's completely parametric (about 20 parameters), and they're all clearly explained in the code file. VIDEO here : http://www.youtube.com/watch?v=ZVg8XCQSZRU I'm using this as part of my parametric printer enclosure here: http://www.thingiverse.com/thing:39787