Kossel Roller

Since I really like the simplictic solution here https://groups.google.com/forum/#!topic/deltabot/VM9439t1Ggc/discussion (yes, the site doesn't parse the URL properly), and I also have those Openbeam parts, I decided to try to create the kossel roller to make that design work. So far I've done what can be found here, but this is a work in progress. I decdided to put this here in the meantime, in case someone feels like improving or have anything else to improve this!

Main issue here is putting on the lower rubber band on the front... and I haven't tried this part yet... also, the holes for nuts for the rods needs to be larger...