This is an adapter plate to allow you to replace the stock custom 50mm fan in the Nintendo GameCube with a standard 40mm x 10mm thick fan. Example: Noctua 12v fan with it's low noise adapter for quiet operation.
Noctua 40mmx10mm FLX 12V model:
https://amzn.to/2JXbJAe
The plate mounts to the stock GameCube fan frame with the original fan screws and then you use standard fan screws (that came with your new fan) to mount your 40mm fan to the plate.
Update Dec 8th 2020
Version 2 Improvements over the original:
Remodeled from scratch in Fusion 360
Thicker front plate for more rigidity
Slighter larger Fan opening with rounded over edges
Screw holes have improved tolerances, countersinking and less slop
Overall more refined
Notes:
Print this flat side down. There are some countersunk recesses for the screws, however you shouldn't need supports for them, so I wouldn't bother using them.
From: @RetroFrog
Noctua 40mmx10mm FLX 12V model:
https://amzn.to/2JXbJAe
The plate mounts to the stock GameCube fan frame with the original fan screws and then you use standard fan screws (that came with your new fan) to mount your 40mm fan to the plate.
Update Dec 8th 2020
Version 2 Improvements over the original:
Remodeled from scratch in Fusion 360
Thicker front plate for more rigidity
Slighter larger Fan opening with rounded over edges
Screw holes have improved tolerances, countersinking and less slop
Overall more refined
Notes:
Print this flat side down. There are some countersunk recesses for the screws, however you shouldn't need supports for them, so I wouldn't bother using them.
From: @RetroFrog