This is a test tube rack that holds sixteen 15mm tubes. Can hold smaller tubes. Base is 130mmX130mmX50mm. Designed in FreeCAD and exported to STL. Created for my chemistry teacher at my university.

Directions:
Is printed in two pieces. A brim will help the prints stay on the bed if you do not have a heated plate. Once the two have been printed then attach them with screws. Requires M5x20mm flat head screws to attach the top to the bottom. Printed with PLA filament.

Bill of Materials:
Filament used= 39.89m total 
Approximate cost= $5.73

Cost of a wooden 12 slot test tube holder= $32.00 (http://www.marketlab.com/wire-test-tube-racks/p/Half-Size-Epoxy-Wire-Rack-for-10mm-13mm-Tubes/)

Savings= $26.27