Trammel of Archimedes

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Human: Animation: Wood vs. 3D Print; More Info: https://www.instructables.com/id/Trammel-of-Archimedes/ This ingenious mechanism consists of a sturdy base with two intersecting slots at perfect right angles. Two smooth sliders are precisely confined within the slots and securely attached to a versatile handle by rigid pivots (screws) at fixed positions along the handle. The mechanism can be expertly used for drawing a flawless ellipse by positioning a writing instrument at the end of the handle while making a complete revolution. With that said, it is often sold in novelty stores with intriguing names like Bullsh*t Grinder, Bullsh*t Masher or Do-Nothing Machine. Interestingly, most of the names are preceded with state names such as Arkansas, Kentucky, etc. I guess that's how locals poke fun at their neighbors.