Educational Piston Demonstration
myminifactory
On the high end, models on Amazon that pertain to rotational to linear motion lessons tend to cost at least $30 and demand an in-depth understanding of involved mechanisms. This simplified model is perfect for a young child to grasp, demonstrating how the gear's rotation causes the piston to move up and down. This print, if printed with 100% infill, requires roughly 100 cm^3 of PLA material, which translates to about $2.5 at $20 per kilogram. This price point is much more affordable for a model that can withstand rough handling by small children during school hours.
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