I wanted one of the copper light-up icosahedra for the bookshelf in my office. I wanted to be able to leave it on to enjoy periodically without putting a bunch of the CR2032 coin cells in the landfill. I also wanted it to be easy to operate without using tools, and not super fragile.
After a fair amount of experimentation, I came up with this tiny 3D-printed light. It uses a rechargeable LIR1254 coin cell that can be easily removed (or swapped) for recharging in an external charger.
The bottom panel hinges open for access to the light. I used strips of foil made for EM shielding applications and tiny neodymium magnets to hold it closed.
I have been playing with it for a few days, and it seems to meet my design brief above. It runs for at least several hours on a charge (I haven’t yet exhausted a fully-charged battery with it).
I put the 3D model (STL) for the battery holder in the Archive for free download, in case it is of use to anyone. There is also a basic icosahedron pattern with the previous Small Polyhedra post.
There is a 3.5-minute video short walking through the design evolution and assembly.
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