Concentric Fidget, print in place

thingiverse

I've printed this in PET-G and PLA and ABS, it's a fantastic fun desk toy, and demonstration for 3D printing. You can get some of the outer rings apart, but you have to try hard, so not completely perfect, but decent enough. I printed with a 0.4mm nozzle and accuracy worked out very well indeed. Drawing it was literally three steps: 1. Draw concentric circles with correct diameters for width of rings and spacing. 2. Revolve the rings around a central axis. 3. Cut the sides off symmetrically to create a perfect cylinder shape. I expect there may be a more elegant way to do it, but it's a fun 10-minute little exercise to draw your own if you are new to CAD design software.