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Perhaps this doesn't belong on a machining forum, as I designed this engine to avoid using machined parts. Instead, everything is off the self, laser cut, or 3D printed. I used a graphite piston set from air-pot. To simply the crankshaft, I used a bell crank to offset the power piston motion...

Hey All, I'd like to share some information on a 3D printing filament that I believe can be used in place of foam for lost foam casting. This allows you to go from a 3D print to a finished casting with basic equipment without burning out the plastic investment. This filament is sold as...