JD Geared Fidget Engine Piston

JD Geared Fidget Engine PistonA geared engine piston - for learning the mechanical principle of how an engine works.Also great for idle fidgeting. Fast printing, even in 4 colorsMinimum waste: Each part finishes separately4x gearing for faster piston movement with less workSkeletonized open view base for a better view of the mechanical principleEasy to assemble in 4 simple stepsEasier to hold thanks to a widening of the base around the middleBoost MeSupport my work by boosting me (it's free) :)This means a lot to me, and I shall endeavor to use the given support on filament, coffee and my little dog.