I'm a biology PhD student and many of my experiments involve using tubes of different sizes. It's a pain to have three different tube racks around me on my bench. This was my second time coming to the Design Lab to print a tube rack that can hold multiple sizes - this one can hold 2 50mL conical tubes, 4 15mL conical tubes, and 12 1.5mL tubes. It was a great experience, the staff were so friendly and helpful, and I'm looking forward to coming back to 3D print more things!