Ball-Chain Pulley and Penny Pendulum Zip-tie Clips for Polargraph

thingiverse

This modified ball chain pulley is based on "Parametric Ball Pulley" by zignig (http://www.thingiverse.com/thing:1322), designed to fit specific stepper motors and chains with rear-mounting capabilities. A small, quick-printing attachment is also available for use with rolls of pennies or other weights on a ball chain, secured with zip ties. This part is parametric, allowing adjustments according to ball-chain and zip tie measurements. It's a simple replacement for "Weight for swinging pendulum" by Bre (http://www.thingiverse.com/thing:17016). To assemble the pulley, attach it to your stepper motor axle using a captive nut (optional) and a screw. For attaching weights, print out the provided attachment design, which works best on Makergear Mosaic printers. Thread zip ties through the rectangular holes and secure rolls of pennies or other weights. Finally, pull the ball chain through the hole and lock it in place by pulling down.