QU-BD OneUp/TwoUp Pulley for Gantry Counterweight

I modified lwilder's Parametric Pulley Assembly (http://www.thingiverse.com/thing:571542) scad file to allow you to change the radius of the pulley, added a guide to help keep the rope in place, and modified the dimensions of the mount.

What I use it for is supporting the gantry with a counterweight. Just attach the pulley to the top with double sided tape and string it up. The current size of the pulley is sufficient for allowing a rope to go over the top without rubbing against anything, but if the weight you are using is large you may want to customize this to make it larger. For a counterweight I started with a small pill bottle filled with coins, and then added large steel washers to the string.

When I was printing the mount my X-axis got nudged out of alignment so I killed the print early. If you use the skate bearing pulley you can cut down on the amount of plastic this uses as well as print time.