How to make your MM 550 great again

I didn’t use my Sennheiser MM 500 for long time but resurrected them a few days ago to compare these to my headset provided by my employer. I realized a weird cracking in the left ear which reminded me why I didn’t use these pairs for a long time. I decided to figure out what exactly causes the sound issue. After taking away the ear foam there is a mesh which also have to be dismantled. I checked the speakers and realized two plastic parts. After a little bit search I identified the small high tone speaker on top of the main speaker. The seat wall where it is pressed in is broken – on both sides. The mic still sits great there. After gently pulling out the broken plastic parts the headset is working like on day one… Give it a try if you own a pair of these, it is worth it.

NanoNAS

As I got my first feedback on thingiverse I want to inform everybody to be careful when you put the upper case over the external ports as this is the most fragile part. Designwise I didn´t found a workaround for this area as result it can happen if you push too much that the connections between the ports break off but with a liztle bit patience you can set iz in place as one piece.