Cold Boxes

These containers are able to maintain a cooler temperature inside for longer than a common thermal bag. Due to the thickness of the walls and possibly the Knudsen effect created by the infill pattern, the interior remains colder. I designed three types of containers, and I used the smallest one to test the temperatures with a refrigerator thermometer.

3D printed cold box 
 

Fridge: 3 Perimeters, 15% gyroid infill. Room temp is 23.2° 10.1 C° 7.21am → 21.5 C° 8.21am 

*Fridge: 3 Perimeters, 15% gyroid infill. Tin foil added to lid. Room temp is 23.5° 9.8 C° 9.11am → 21.8 C° 10.11am

Freezer: 3 Perimeters, 15% gyroid infill. Room temp is 23.6° -11.6 C° 11.02am → 18.2 C° 12.02pm

Common cold box (thermal bag)

Fridge: Room temp is 23.6° 10.3 C° 8.56am → 23.6 C° 9.56am 

Freezer: Room temp is 24° -11.0 C° 12.14pm → 23.8 C° 1.14pm

*the tinfoil added to the lid experiment didn't add any advantage so is omitted it in the graph.

I printed these containers in PLA, with a TPU gasket. I also designed tiles that can be refrigerated and inserted into the containers to keep them cold for longer, at the expense of some space. The fit of the lid depends on the variables of your filament and your 3D printer.