This is a rack that allows a user to hold both a 2 mL (12 mm diameter) autosampler vial, as well as a 1.5 mL microcentrifuge tube. This was created as a side quest after a scientist got tired of the mild inconvenience of having the 1.5 mL microcentrifuge tubes wobble around too much when trying to dilute standards for mass spec use. Printable without supports, each rack has 30 spots and can connect to other racks using the provided pegs (put a drop of glue on one end before inserting).