Modular Tube Storage Rack

Everyone who dabbles in electronics is familiar with the annoyance of storage boxes with compartments that don't seal up to the bottom of the box, right? Small parts like resistors just roll under the "walls" and get all mixed up. I wanted something to organize resistors in enclosed compartments. There are some cool sewing organizers, systems of complete boxes within a larger box, but those solutions are no fun -- they don't involve 3D printing.

The actual containers here are clear plastic test tubes I bought from Amazon, link below. I've uploaded models for two versions of the tube holder, a single holder and a fiver. Both styles have connecting holes; just print the "connector" model and put them together.

The connecting holes are d=10mm and to be flush on the back the knobs on the connector straps are h=2. The knobs are d1=9.25 and d2=9. While they do pressure fit, I didn't dial them in to truly "lock." My intent was to have them just provide stability for each other