Ant test tube rack - simple, stackable

This is a simple, lightweight rack designed for holding queen ant test tubes (though I'm sure it could have a range of other purposes). Stackable so long as there are a few same-sized tubes on the lower racks to support the upper racks.

Print 2 of part A and 2 of part B, inserting the ends of part A into the slots of part B. It's designed to fit very snug and to hold without the need of glue, but depending on the tolerances of your printer you may need to scale up or down part B slightly (or you can add some glue if you want).

Because of the narrow sections in contact with the print bed, you do need good levelling and good adhesion to avoid them coming loose. Glue stick helps, or you can add a brim if you really need to.