Based off @scheff's gridfinity blanks: https://www.printables.com/model/374789-gridfinity-collection-solid-bins-for-customization

A 3x3 Gridfinity based socket head holder with 18.3mm holes. I'm using mine to hold torx bits, allen bits, philips/flathead bits and whatever other miscellaneous bits I find rolling around my toolchest. 20 holes all of identical size and spacing.

Item in photo was printed with Overture white PETG, as it will be stored in a garage without climate control.