People at work kept asking me what the laser could do, so I made up this widget to show them, cut from 3/16" acrylic. Note that the only thing holding it together is friction: the pieces were cut to a zero-tolerance fit, I had to use a vise to put it together.
The CorelDraw used to cut it is also attached. Note that if you try to cut one of these yourself, do not scale it: the adjustments to the finger/slot sizes will scale also, and it either won't stay together (if you scale it smaller) or won't go together at all (if you scale it bigger). When I get some of the user interface details worked out, I'll post the VBA code used to generate the drawing.