This is a stand for perfume sample bottles.

It is designed to print quickly in vase mode, using very little material, great for using up filament remnants.  Being vase mode compatible it needs no supports or infill.

The STLs provided are for 2ml bottles with diameter 12.5mm, and 5ml bottles with diameter 17.5mm.

OpenSCAD file is provided to customise for any number of tiers, number of bottles per tier, and bottle diameter.  Set tiers and bottles per tier both to 1 and run a test print to test the fit for your bottles.

On models more than 4 bottles wide it is necessary to print with a small brim or raft and leave it attached, it binds together the gaps that make vase mode possible and prevents fanning.

Perhaps it might work for bio/chem test tubes, or miniatures paint bottles, though I've not tried.