I’ve been having trouble getting my chairs at home not to scratch my floor and after several failed attempts at solving the problem I have considered the solution which should have been obvious to me: 3D printing the anti-scratch thingies!
The final working design envelops the foot of the chair and plugs into the hole in the foot of the chair.
By beautiful chair:
The bottom side of the leg:
The bottom side of the leg with the printed sock:
The top side of the leg with the printed sock: