Modular Test Tube Holder (Dice Storage)

No supports, no hardware! Everything prints flat - and while I recommend superglue, you need nothing else.
Note: The long shafts are designed specifically to print laying down flat on the print bed (not standing up). This gives them better dimensionality and strength.

I used tubes like this, but the CAD is parametric, so you could tweak it to what you need. I wonder if there is a 3d printable version that would work? The store-bought are cheap enough, and the clear looks best though, imho.

Stack one, two, three, or more layers of test tubes in this rotating carousel. I use it to hold dice and game tokens and whatnot - but you can use it for whatever.

To assemble:

• Take the inner pillar shaft and dovetails, and assemble them.
  A touch of super glue on the, and the sleeves can be used to hold the shaft straight while the glue dries.
• Place the bottom-cap-dovetail on the shaft, and slide it into the base
• Slide the sleeves and carousels over the shaft. Slide the top-cap-dovetail on the shaft just before or after you place the last carousel atop.
• Fill the carousels with your test tubes!

If you need taller, you can print more shafts & dovetails continue extending the pillar vertically, and then just stack more sleeves and carousels to get as many levels as you want. Well, until it tips over!

Note that this project include some test files that you can use to make sure your tolerances look good, that the carousel will match your tubes, etc, etc
Onshape CAD here

With this design, you can just disassemble by lifting up the carousels / sleeves to take it apart. Don't turn it upside down! It could be designed differently, thinking about making the shaft light up with some LEDs - but I'll upload it as-is for now.