My colleague broke the fin of his Raymarine ST50 wind transducer. One evening with OpenSCAD + printing = problem solved. :)
Transparent PrimaSelect PETG from PrimaFilaments. 230C/0C (0C plate as I currently have Clas Ohlson build surface, on which things stick almost too well).
Removed supports & carefully drilled the inner mid hole a bit deeper&bigger than printed.