Engineer, maker, and 3D printing enthusiast Evan Stanford has created a 3D printed, hand-cranked mechanical laser show machine that ‘draws’ with projected light. The drawn shapes are created with two rotating cams that combine to repetitively determine a laser pointer’s light path over 35 points. When the cams rotate quickly—according to Stanford “around five times a second or faster” works best—the entire shape can be seen.

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In the video above, he reviews the math that went into mapping the cam shapes. You can also download the open source files to print your own.

Related reading: Cartesian coordinate system and trigonometry.

Related vids: Boy gets prosthetic hand made by 3-D printer, a 3D-printed candy sorting machine, Creating The Never-Ending Bloom: John Edmark’s spiral geometries, more 3D printing, and more math.

via Boing Boing.

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