Test Tube Plant Propogation Stand (4 holes, various diameters + F3D file)

A plan propogation stand for flat-bottomed test tubes. I have over 20 of them laying around and tipped them over like dominos more times than I'd like to admit before printing this!

There are several STL files for different variants as well as the Fusion360 files if you need to adjust the size (via a parameter).

I found my glassware measured inconsistently between 29mm-30.5mm and the overhangs were a bit rough (0.3mm layer &speed printing) leading to requiring a bit more clearance where 31mm was acceptable.

Adjusting the size

Using Fusion360 (free), I believe you can download the F3D file, add it as the project, and then adjust the parameter if you need a smaller or larger size.