Arduino Nanos are super useful in many projects but often tedious to mount, especially if the mini-USB has to be accessible or is used regularly.
This easy to print sleeve case protects the Nano and has clear dimensions at the USB side (10x20mm). Just provide a fitting rectangular hole in a panel or any arbitrary 3d printed object and you are ready to go!
The flat bottom can be used to stick the case to a flat surface with double sided tape.
This version is tested for Arduino Nano V3 with 18x43mm PCB. If your board has slightly different dimensions, try to get away with scaling.
Make sure to solder the wires passing over the board to keep the sides of the PCB clean.