The latest workup estimates that the total material cost of one OpenFluidWarmer unit is just under $80 USD!

The five most expensive components being:

1. heaters -> 29%
2. stainless steel trays -> 14%
3. electronics enclosure -> 12%
4. adhesive backed foam -> 9%
5. polystyrene foam -> 8%

As all items get accounted for and the prototype design is further refined, a small (<$10 USD) material cost increase is expected. Another cost increase (currently of unknown size) is expected when the design is updated to include all safety features.