More often than not when in a lab, you will need to use various sizes of different kinds of tubes when performing an experiment. A classic staple in any lab is a rack for holding multipple specimens, and one that has multiple options for sizing is a convenient must-have.

These simple pieces pf lab equiplment can run $10 or more depending on the distributer, but the 3D-printed equivalent is just as good but significantly cheaper.

This one was designed based on the one found below, which costs about $15 each. These racks cost about $2 to print in PLA

https://www.fishersci.com/shop/products/fisherbrand-interlocking-four-way-tube-racks/0344817?gclid=EAIaIQobChMI_f2mtZKu5gIVCr3ACh3HKgKvEAQYAyABEgIKsPD_BwE&cid=PLA_GLA_20191104_E1GQVO&ef_id=EAIaIQobChMI_f2mtZKu5gIVCr3ACh3HKgKvEAQYAyABEgIKsPD_BwE:G:s&ppc_id=PLA_goog_2086145680_81843405274_0344817__386247001354_11899215035494853399&ev_chn=shop&s_kwcid=AL!4428!3!386247001354!!!g!827721591040!0344817