THE PROVIDED STL IS THE LEFT HALF OF THE CENTER FIN! MIRROR THE OBJECT IN YOUR SLICER AND ROTATE TO PRINT THE OTHER HALF!

Medium-sized center fin for surfboards with NSP's (proprietary) “Mini Tuttle" fin box. Based on b3n3d1k7's upload.

Print with 100% infill and tough filament for the longest-lasting fins. Holes (from original) are for inserting 2mm long segments of filament for alignment when gluing the two halves - not necessary, but can be very helpful if you don't have a vice. I recommend using CA glue or “3D Gloop!” - Clear Gorilla Glue was tested and failed pretty quickly. For best glue reliability, print on a smooth surface and then score it with coarse/low-grit sandpaper before applying your adhesive of choice and compressing in a vice/under a heavy object.

I have some Red X X-2 fins available I may adapt as well, if I have the time. If that's something you'd like to print, let me know!