Modular Tube Racks and Plates
thingiverse
The racks can fit up to three plates. The plates are designed for four fairly common tube sizes. If you have Fusion 360, you should be able to edit the f3d files pretty easily.
Download Model from thingiverse
With this file you will be able to print Modular Tube Racks and Plates with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Modular Tube Racks and Plates.