The snap-on clip for 1/2" PVC is just what I needed. I am making a simple machine using 1/2" PVC box with exchangeable components for students to understand how simple machines are made. This handy-dandy clip has made my life so much easier. I drill a small hole in it and use machine screws to attach objects to it so they can snap on to the PVC. I can use it to snap peg board onto PVC, toys, KNEX, McDonalds toys and other goodies. I print out things to snap on like:
Duplo Build plate 8x8: http://www.thingiverse.com/thing:31866
Water Wheel: http://www.thingiverse.com/thing:7715
I have also brought the clip into Tinkercad to make ramps (attach a clip to a box) and 1/2" PVC to 1/2" PVC connectors (two clips with a box in between).