I've got a mazzer SJ with doser, and I've been looking at doing some mods to make the doser work a bit better. Very long ago I did the clean sweeper mod, which was a big improvement, but I've never been very happy with the options of cups etc to cover the centre part of the doser. I've also tried some funnel-ish things to make the doser less messy, but for some reason also not had much luck there.
Earlier the year I built a 3D printer, and a few days ago did some searching on Thingiverse.com.
I found the following two:
First a doser spouthttps://www.thingiverse.com/thing:1341572
and secondly a doser "egg"https://www.thingiverse.com/thing:2398996
A few pics below.
Just posting it, because 3D printing does offer a very good and cheap alternative for modding coffee stuff. Yes, techinically ABS from a 3D printer is not rated food safe, each person (and specifically each lawyer) can have his opinion about that...
If you look at the close-ups, yes there are some ridges visible. In practise they don't seem to have much effect in terms of grinds sticking. I'll spray the unit with plastic compatible paint if it is a problem.
So far, everything works pretty well!
doser funnel (with pliers for scale)
doser funnel fitted
funnel and nosecone fitted