CR-10 Filament Guide and Filament Run Out Sensor.

thingiverse

You will need to print 5 parts: guide - main section, guide - ring-large or guide - ring-small depending on your bearing size. Try guide - ring-large first, guide - spacer, sensor mount - 1 and sensor mount - 2. To complete the filament guide and sensor assembly, you also need a few additional parts: an 608 bearing, which is commonly used in skateboard wheels, an M4 or M3 x 16mm bolt, and three M3 X 20mm bolts with nuts. First, screw the guide together by starting with the bottom right bolt. This will allow the nut to fit into the indent on the main section. Next, attach the top and bottom left parts to the main section. Be careful not to access the bottom right bolt from the back once it is attached. When printing these parts, use the following settings: infill at 25%, no support material, a resolution of .2mm or better, and no raft.