Nice CAD work. That is a pretty mind bending shape.
Molds looks very challenging, likely varying parting plane surfaces & probably sub structure elements. I've seen some 3DP promotional videos where guys are direct printing casting ready wax material, thus leaving only the trivial task of investment & casting haha (that's a joke, I don't even qualify as bystander status). But maybe you can go straight from CAD file to 3DP nickel or bronze, no middle man. I'm guessing their shrinkage & other dimensional issues might be a factor to contend with, but I mean fluid dynamics is complex sh*t. The chances of getting the first iteration 100% right is probably zero even if it were cast perfect. Attached an old Tom Lipton video where he outsourced the handle & did some post finishing. Check the vid but I seem to recall ~75 USD but those prices are probably outdated & not sure if name drop discount although that's not his style. Anyways, easy to upload a file & get a quote. I would think since that time even more services avilable & better quality.
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Yeah there are some wax filaments to directly make parts. The resolution is not nearly as good as sla printing and then making a mould though.
I've looked into direct to metal casting with post print sintering, it is an option with bronze for sure.... so boat props will be much easier if I wanted to pay more