Aquarium water test drying rack

This is a test tube drying rack for an aquarium water quality tester. It has labeled holes for pH, NH3, NO2 and NO3. The tubes can be inserted up while testing to keep track of which is which and top down to dry. It is indented in the bottom so that a thin sponge can be cut to fit to absorb water after the test tubes have been washed. If you don't want to add a sponge, then the walls will prevent the test tubes from straying too far. The four prongs around the corners are to rest the caps on so that they can dry as well.

Print with supports is about 68g (line support) at 100% infill.