I have just upgraded my MK4 to MK4S and was not happy about how the nozzle was difficult to inspect and clean. So i just made this little tool based one of my wife's small mirrors (65x45 mm). It was printed in a mat black pla in 0,30 speed setting and 0,15 infill and with a fuzzy (0.2 0.2) handle. It was an easy design in Fusion360, and should be easy to redesign to other sizes of mirrors without any problems.