Corona688 designed a functional pump with STL and SCAD parts.

3D Printing
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1

Corona688 designed a functional pump with STL and SCAD parts.

http://www.bld3r.com/obj/5784157816881152

2

It seems the basis of this is similar to a wankel engine.

3

@Reinhardt_Kraemer “All pumps work in a very similar way to the gif above”? I disagree.