The fixture created will fit directly to a Bontrager Glo bike light. They can be purchased on Bontrager's website for around $12.
In this remix, I designed the bottom edge of each platonic solid to act as the fitment disc that I made in the original Platonic Solid instructable. In order to do this though, I had to design the platonic solids from scratch in Rhino CAD, instead of using someone else's platonic solid design.
This instructable with guide you through the steps of how to design the platonic solid bike light fixtures from beginning to end.
You will need: Rhino CAD program, some design skills, and access to a 3D printer.
This specific instructable is only for a dodecahedron, but you can use these methods to make a tetrahedron, octahedron, and hexahedron- you choose!
You can also check out my other instructable for an easier way to make one if you are not as experienced in Rhino or CAD drawing.
Access to a 3D printer is easy if you dont own one, there are companies like Shapeways that will print your design for you and ship it to you!