Based on the idea by Cleven (http://www.thingiverse.com/thing:455507/#files), this design provides a simpler more durable ratchet. Instead of four printable components, only two are required to achieve the same functionality. To reverse the direction (tighten/loosen), simply flip the ratchet. I use this ratchet regularly to remove or re-install the second extruder nozzle when only single extrusion is required, to prevent the second nozzle from interfering with the print. The socket.stl file can be printed and used to do so. Alternatively any standard metric 6 mm square socket insert could be used with the ratchet. Comments and feedback welcome!