I needed a test tube rack, but none of them were quite right. 

Designed to hold up to 12 tubes measuring 25 mm in diameter by 60 mm, as shown. Although stackable, the structure cannot support much weight.

Some assembly is required, as no glue is used; all parts must be snapped into place. In my case, all parts fitted without scaling. If you have difficulty fitting the parts together, try enlarging or reducing that part by approximately 1%.  

For every rack, you will need to print:

• 1 x Base
• 1 x Grid
• 2 x Side panel

Feel free to remix this simple design.

To get the same “skeleton", finish, simply reduce the number of top and bottom layers in your slicer and choose a fill pattern.