NanoBox: a simple case for the Nvidia Jetson Nano.
I left an opening for the heat sink at the top, which should permit attaching a fan using the screw holes already in place. There is also an opening at the back for easy access to the microSD card slot.
Still not clear how hot will the Nano get under heavy load. Make sure you select a filament material that won't deform/melt easily under your working conditions. Broadly speaking PLA will start to deform around 60ºC / 140ºF, PETG at about 80ºC / 176ºF and ABS around 100ºC / 212ºF.
UPDATE 28/APR/2019: trimmed 0.5mm the support columns for the top part for a better fit.
UPDATE 03/MAY/2019: there is a newer version of this thing: Jetson Nano Case -- Connectors' Edition
UPDATE 05/MAY/2019: jptvette found some information on Nano temperatures under load, peaking at 69ºC. Consider alternatives to PLA if you plan to stress your Nano during long periods.