Window Skylight Shade Rod, Pulley, and Bearing

thingiverse

I utilize these units to construct my motorized skylight shades. I have four pairs for each skylight window, with windows angled so that I use a rod on top to roll up the curtain/shade and a chain on either side to maintain the shade's angle when rolled down. The bearing fits very tightly into the wall mount, with an ID of 8mm/OD of 22mm and spacing below the race ensuring perfect free spin. The pulley is designed for use with a 4.5mm beaded chain; it was derived from http://www.thingiverse.com/thing:867 and modified to fit snugly around the chain. The curtain rod or roller is a lightweight 7.5mm aluminum rod shaped like a star that locks into the pulley; I salvaged this rod but they can also be found at HD and Lowes for an affordable price. A small sample of the rod is included in the pics, as well as a clip that slides onto the rod to attach the curtain with ease - four clips are evenly distributed along the rod. To assemble, I printed these units in PLA using a layer height of .35mm and a nozzle size of .5mm, achieving an infill of 15%.