Finally I get a chance to post about the mods I've done to my Mazzer Mini. I think that everyone agrees about how messy the Mazzers can be. I mean, as good as they are, they have their flaws and one of them is that the doser chamber doesn't sweep very clean. And for home users, it can be a real pain because you obviously don't want to waste any of that $20 - $40 a kg coffee that you bought. Thus the term Black Gold.
Anyway, the first thing is to take the doser apart. That involves using a flat head screw driver and unscrewing the middle screw. Then you unscrew the entire doser star anti-clockwise until it comes off. Underneath the doser star, you'll see 2 smaller flathead screws that you can remove to take apart the doser star as well.
This is what you should see at the end of it.
I then applied the cloth tape to the doser according to the http://www.thebeaningoflife.com/mazzer-mini-coffee-grinder/mazzer-fins-2.01b.html but I made mine a little longer which in retrospect may not be such a great idea.
I also applied tape to the doser star "top part" so that it sweeps clean over the drop chute cover. The pictures probably tell a better story.
As with the problem of the grind getting spat over over the middle of the doser, I applied a flap over the chute so that the grind drop directly down into the chambers and not all over the doser. And with the flap, I can still lift it up to sweep all the remaining grind out of the chute.
I haven't made any modifications to the drop chute yet and it's still dropping left a lot, but I've learnt not to clack it too quickly and that helps.
Will continue to look at how to improve the doser's messiness as I ran out of beans the last few days and haven't had much time to test. Stay tuned.