This is a remix! Because i dislike glue.

I have added two hooks that bind to the holder, and hang from the shelf. The shelf has a 1.89 cm depth so the hole in the hooks is 1.90 cm deep.

Hooks make the thing movable :)

Use a CAD program (e.g. FreeCAD or whatever) to tweak this to your lab furniture.

There is 0.2 mm tolerance between the hooks and the holder, and it came out fine. There are two small budges where the parts slide together, that should help keep the things in place (note: those were removed in newer versions).

Don't wanna have those Gilson pipettes fall into your precious experiment!

I tested the original design and the pipettes were slightly prone to slide off. To prevent this further, I made the hooks tilt the holder by 5°.

After all, scientists are also just users.

I have done decent testing and found that it would be slightly more comfortable if the pipettes were a little bit more separated from one another (horizaontally). Not a dealbreaker, but I might try to fix it later on.

v3 - First upload, works fine with the hooks
v4 - Now the holder slides from the top, the model includes the hooks.
v4 - This also results in the holder being a little bit higher, making it potentially less stable (because it hangs by leverage, and not glue).
v4.1 - Bugfix
v4.3 - Increased the hook's distance, so the holder hangs from below. I think this will give it better stability.