In honour of the 30th Anniversary of ReBoot this year, I have made Glitch, Bob's Keytool.
The gear is held on with two 10x1 magnets, spins freely and is removeable.
Each part was printed support free in the appropriate colours.
The cylinder pieces have 2mm register holes, just use pieces of filament for alignment and a bit of superglue to hold it all together with the main body part.
Check out my other model, Copeland, Turbo's Keytool.
The author marked this model as their own original creation.