AirPuck v1.0

thingiverse

This is a revival of an old Physics favorite: The air puck. These used to be driven by CO2 in a metal framework. Unfortunately, plastic insulates too well. This one uses a balloon and a discarded CD-DVD. Build it on a carefully leveled and tightened extruder (to ensure circularity) and you'll get almost frictionless air puck action. There's a problem with the nozzle though - an inverted rectangle causes it to shut off. Look for v2.0 of this project for the fix. Instructions Some assembly required here. The small pins fit into the four holes around the base. The base fits snugly into the hole of a standard CD. The four wings are designed to hold standard physics test masses, which changes the overall mass of the puck. The nozzle sits on top and needs a balloon to work right. I use 5-minute epoxy to glue it together but cyanoacrylate glues will also do.