The Sennheiser MD421 is a versatile microphone used for many applications but it has a very special clip. Now you can print your own MD421 (and similar Sennheiser microphone) clip. The clip works with most normal mic stand adapters (e.g. Shure) but you can also print your own from e.g. http://www.thingiverse.com/thing:145635To get the arrest working, also print the "knob" and drive a 2x20mm screw through the middle to thread a hole (maybe make a 1mm hole before to not break the knob). Put a small spring below the top of the screw and push it though the 2,2mm hole in the clip. Then attach the knob on the top end of the screw again after you have put it in the recess at the bottom of the clip. You might have to file the borders of the knob and the top of the recess a bit to make it fit and move properly. This is the first version but its quite usable already, feedback is welcome, if I make any improvements I will upload them as well of course.