First option prototype

We decided to try several options.

The first option is to try is a combination 3d print and metal where the 3D print is waterproofed with liquid plastic. We designed and printed the tube holder as in the figure below. We also had to design and cast a gasket. The external housing is a wider commercial thermos box used for hot or cold liquids - aka a soup thermos. The agent - isopropyl alcohol will be in the thermos box under the tube holder. We are still figuring out details but it looks promising.

 

Tube holder with a couple of sample tubes

 

The assembled enzyme coolers