Summary

Three designs for test tube racks, on one A4-sized sheet. Each one holds 6 15mm test tubes securely.

Instructions

Cut out all the pieces, then slot them together - each one has a blank base plate, a lower piece to sit immediately on top of that (providing blank dips to hold the bases of the test tubes secure), and an upper piece (identical to the lower piece). The long thin rectangles are the verticals. They should hold with friction, but a dab of glue is a good idea anyway. The file's set up to use with 3mm thick material - if you want to use something else, change the width of the rectangular slots in each plate.

Test tube racks