I was looking for a GameCube controller holder for a long time, and I found one here on Thingiverse! I couldn't find it earlier because it was labelled as an N64 controller holder. Thanks SoulEaterGaming!

So I decided to replace the N64 logo with the GameCube logo on the design to make it look better and be easier to find.

The hooks are satisfying to put into the holder and it seems to work well. Just slide them in through the back.