The AC1200M is a nice cheap 5Ghz router but it gets very hot and slow. So this is the solution.
I added a thin plate of aluminium to help the heat diffusion and some heatsinks designed for Raspberry Pi chips.
The fan is a 12V 4cm. It works very silently because the router uses 5V so it is way under-volted.
The author marked this model as their own original creation. Imported from Thingiverse.