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Based on this sketch. Created using MakerBot's customizable template. More info at www.thingiverse.com/thing:229295
The image is converted to a surface of varying thickness. Dark areas are thicker and light areas are thinner. (Similar to converting a heightmap to a terrain model.) Held up to the light, thin areas are more translucent than thick areas.
File to make this pulley is here:
www.thingiverse.com/thing:12403
Part of my Polargraph re-build:
Printed on my Makerbot.