15 and 50 ml test tube holder

thingiverse

Lightweight tube rack for holding 15 ml or 50 ml conical tubes (or 20 mm diameter glass tubes). Brief assembly is required, but the advantage is that the print does not require supports as a result (see post printing notes for more). I originally made this since the larger Nalgene tube holders we have in the lab are somewhat cumbersome to carry around if you have a small number of tubes.