Thanks for the stl file, I’ll import into Alibre and try to design a metal version around your dimensions. I’m thinking of starting a prototype out of thin mild steel, and if that works, move to fancy titanium or thinner stainless, to try and keep it light weight but high strength.
Tim
edit: Will have to study blade design to see how to get the desired lift, but maybe just start with flat blades to get the balance right.
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Looking forward to seeing it 
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Home made printer… I love that!! I made my own CNC plasma cutter. Fun to use the machine you built right?
Tim
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Sounds like a happy couple. 
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That is awesome, I do wonder how close you guys could get to normal blades to fit and just how bad the power drop is on 150w motors
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