Windsurfing Fin

I picked up a free windsurfing board and it was missing a fin so I made one up for it.

It fits a US-Slot style board. Dimensions of the slot part are 8x145x35mm with a 4mm hole and 5mm pin. Total height of the fin (including slot) is around 360mm.

I had zero windsurfing experience when designing this fin so just made it look like a fin without any idea for what I was doing. It gets the job done though, at least for a beginner like me who is still learning how to windsurf and doesn't know the difference between a good and bad fin.

I printed in PETG with 4 walls, plus alternating extra wall, 30% aligned rectilinear infill aligned to be perpendicular with the walls. It feels strong and I'm not concerned about breaking it (as a beginner) but is more flexible that I thought it would be, not that I have any idea how flexible a fin should be. With 45deg z rotation and 30deg y rotation the fin just fits inside my ender 3 220x220x250 build volume. With this orientation I put support only under the slot part as shown, with nothing needed under the trailing edge of the fin.