This is a coffee bean tube holder for glass tubes at 30mm diameter. It's modeled off the original wooden holder that came with the tubes, but adapted so it can hang on a Kungsfors railing system from Ikea.
There are two versions posted. One holds 12 tubes. The other version allows for an extra spray for RDT. The spray bottle modeled here has a 10mm diameter.
Attaching the hooks requires heatset inserts for M3 screws - I found this much safer than just screwing into plastic alone.
I used this system for about two years, after which I switched to a horizontal rack - which I have also posted here - that's why I am only adding renders, not pictures.
The author marked this model as their own original creation.