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Model dimensions:
The model was made as a shell with 3 mm thickness. I think, that it will help to attach the fin more closer to the shape of the head. Also it will be better to print this model as the sample, attach to the head to understand should scale the model or not before quality printing.
Useful links: https://www.youtube.com/watch?v=mcLbryFaHtw&ab_channel=FandangoNOWExtras https://www.youtube.com/watch?v=sSPpMb0RCFw&ab_channel=NEEKCompilations https://www.youtube.com/watch?v=_DipdXWGSnk&ab_channel=Ilovehertjes