Summary

Build with OpenSCAD, you can specify any size, space, number of rows, etc.

Build a custom rack for test tubes, condiment, ointment, Wheel lock key sets... anything that fits a cylindrical hole, or a conical hole, or a stepped hole.

I made this library for all my rack needs, and I like small files I can source control. So while is not a remix of the Toyota Master Wheel lock key set holder by Tuan2410, I thought I would reference it as one example is a clean-room clone of that.
Updated 2026-03-04: added an optional finger grip, and made the sample customizable with the Customizer.