Turntable spool stand

This needs a cheap 6002 bearing with dimensions 15x32x9mm.
Google for "bearing 6002" you'll find plenty of places to buy, and go for the cheapest you can find. Usually can be found in bike spares shops.
Alternatively adjust the sizes in scad file for whatever bearing you have.

For the spool not to slide off the top, I glued some rubbery tape on it.
Google for "self amalgamating tape" to find it.