SMD organizer rack for micro test tubes (stackable)

I store my electrical SMD components and other small parts in 2ml micro test tubes (eppendorf tubes) as they are cheap (got 1000 + shipping for less than 20 EUR), small and also easy to handle.
I created this rack set to have them neatly stored.
The base plate can hold 40 of the 2ml test tubes. The slots are designed to align the lids all in the same direction which makes it easier to read the labels on the lids.
Also the test tubes can kind of "snap" into the slots, which prevents (or at lea