Noctua 40mm Fan Adapter MP Mini Select (V1 & V2)
thingiverse
This adapter works with most 40mm fans and is designed to use the screws from the machine and the fan. I screwed in the fan from the backside. The four holes can just be covered with tape to increase efficiency but it works fine as is. The fan I used: https://www.amazon.com/Noctua-Cooling-Blades-Bearing-NF-A4x10/dp/B009NQLT0M/ref=sr_1_2?dchild=1&keywords=noctua+40mm&qid=1614718218&sr=8-2
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