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.


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.

Cetus Tinyfab CPU config + Cura

As I accidentially deleted last week all config files from the SD.card of my tinyfabbed Tiertime Cetus printer I took some Corona time the last few days to rebuild all config files for the upgraded Cetus printer. I use the heatbed with external controller board plus the tiertime CPU plus the tiertime TFT on a MK2 Cetus. It is mandatory to upgrade to physical endswitches!!!

find HERE a package with a working cetus setup file plus mypanel config and the mandatory cura (4.5) printer config. Hope that helps anybody out there.

Ultra Corona

due to the fact Germany is in a kind of lock down I took some time to work again on the fully printable frame design.

This is one of the less options available to pack the needed modules in an ultra tiny 135mm formfactor. there is not much space left and this is not a final stage but could be a base for the next prototype. I will see…