Mining Rig GPU Cooler 2020

I am going to make a mining rig of 2020 alu bars. For this I want to use 120 mm fans directed to blow from underneath the GPU's, for extra cooling. I have some ploblems printing above 10x10cm with my Micromake D1, so I'll order a new Micromake C1 :)

The idea is to make modular part connected together to fit different GPU lengths.