K1 Max 80mm to 120mm fan adapter

I have consistently found my K1 Max to be excessively noisy, particularly during overnight operation. To address this issue, I designed an adapter to convert the 80mm rear cabin fan into a whisper-quiet 120mm fan. This is still work in progress, as I have yet to decide whether to wire a 24V fan directly to acquire a converter and connect a 12V fan.

The original screws from the 80mm fan can be a little short, however they may be slightly too short. This issue will be resolved in v4.