Slight change to Greg's excellent x-carriage.1, I broke at least 2 x-carriages while trying to insert the bearings (I didn't warm up the holders first) So i change the holder design a bit to let the bearings slide in easily, then i added 2 build-in ziptie channels to the holder themselves.The included STL fits felt branch x-ends. if you need something different, download the scad files and put them into the same directory as configuration.scad.