The file 'Lego Engine Piston (butterfly 4×6) 3D Printer Model' is (stl) file type, size is 5.8KB.
this is a butterfly styled piston for lego vacuum engines. it is 4 studs by 6 studs. remeber, the correct direction is flat while going upwards, and it needs to be offset by 1 stud on the crank!
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butterfly_piston.stl | 28.0KB |