Ball-Chain Pulley for Polargraph
thingiverse
A ball-chain pulley designed for 3.5mm ball chains is useful in Polargraphs. It can be easily found compared to the type used by Sandy on his Polargraph. The stepper motor mounts are slightly modified versions of Ed's design. The ball-chain required can be sourced from kitkraft.biz. An updated gondola for the device is available at thingiverse.com/thing:12557. The pulley is sized for a 5mm shaft with a 3mm bolt/nut setup for tensioning on the shaft; adjustments can be made in the .scad file if needed.
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