I can see that being especially important for foil drives 
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To repair a STL file, a slicer might do it (eg Cura + “Mesh Tools” ext).
When it becomes tricky, you have free online solutions while they last:
1 - Formware: –Free online stl repair tool (powerful, high granularity)
2 - Aspose: –Convert any 3D formats online (std)
…
Source: 'https://all3dp.com/2/stl-repair-fixer-tool-online-offline/
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Got another quote, at 15 usd per balde by QTY 60pcs (20 triblades)
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That is not too bad a price if you can find enough people. Which 3 blade propeller hub design would this be for?
Others have also designed similar hubs.
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Excellent price - we now know it’s feasible.
To get the full picture, please inquire if they can split the 60-piece batch into multiple shipments to various locations.
Well I have other ongoing projects with this company, so unsure how realistic this price is, maybe they just wanted to be nice. Individual shipping is out of question I think.
Will check on later how I could organise an order.
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I am in for 9 blades.
That’s crazy cheap for 60 blades, anything under a couple of hundred you are surely just paying setup. Assume that is raw and they need to be anodized after that? May be good to print the complete hub and blade setup in nylon and compare performance with the Foil Drive setup, I have the original Foil Drive 3 blade hub and don’t like the design much. Assume the 2nd Gen is improved. I’ve gone back to FD blades with my own printed hub. The alloy blades are really good.
Once proven I’m sure we could rustle up greater number than 60 pretty easily, you may have just started yourself a little business 
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There is a post on fd owners group with multiple comments about alu blades prop base or bolt failing.
For example:
If you use alu blades , you have to take into account the larger forces applied upon the hub and bolts in the instances of hit, vibrations, open/close, in/out of the water
Their hubs include inserts.
As a consequence of bolts failing they release now new bolts and fun thing - instruct owners to do DIY work on their hubs 
Another engineering masterpiece - a bolt.
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And they recommend inserting a nut designed for injection molding with a soldering iron. It just doesn’t work!
Foil Drive just half#rse everything they do and then somehow sell their customers down the river that its ok that their systems keep breaking. It’s almost as though they are just social media influencing customers to be ok with DIYing an incredibly expensive solution.
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Did you finish 3 blade FD hub design?