Flat-Pack Test Tube Rack

thingiverse

This is a compact test tube holder designed to accommodate up to 10 test tubes. Its current dimensions, featuring 20mm holes, allow it to securely hold both 18mm diameter tubes and the shorter/narrower 16mm tubes. As long as the tubes fit within the 20mm holes and are at least 90mm tall, they will fit comfortably, but you can easily scale up or down according to your needs. It is incredibly easy and quick to print. I've come across similar models, but my slicers had trouble with those files, so I decided to create my own model instead. To assemble this holder, you'll need to print 1 bottom part, 1 top part, and 2 sides. There are two "top" file options – one with open holes and one with the holes enclosed for a single layer printing.