3D model of rack for 2 mL cryotubes. The rack can house up to 36 cryotubes. The 3D model is separated in two parts for easier and faster printing. After printing the two parts are joined together by six M3x12 socket bolts (DIN912). If the holes are printed too wide you can use some type of plastics glue to tighten the bolts in their respective holes. The distance between the holes of the tube is optimized for more convenient work (free opening and closing of their lids without cluttering) with the centrifuge tubes. Designed and developed in the Extremophilic Microorganisms Laboratory at IMicB-BAS, Bulgaria.