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Printing time for this engine depends on the type of machine you will use. I made this engine on a laser sintering machine which is totally different to our "hot glue guns". It is optimized for this kind of machines but maybe if you use a support material that can be removed after the print like HIPS it could be possible to print it on a FDM printer. At the moment I am working on a redesign of my rotary engine to optimize it for this kind of machine.