Decided to try out threaded inserts, so I had to have something to dial the holes in.
This is a simple print, fully customizable.

Measurements are printed on the bottom of the piece.

Set:

• start diameter
• height
• incrementations
• number of incrementations
• wall thickness

then just render it.

There are som more parameters to fiddle with, if you want.

It could also be used as a drill bit stand I suppose...