Disclaimer: I have my Mini only for less than a week;, and know nothing about jewelry.
But I was also interested to see if small parts can be printed and if the resolution can be increased compared to the standard “fine” profiles in Cura.
I had success loading the Expert profiles provided by LulzBot, reducing layer height to 0.1mm and the outer layer speed to 15mm/s. The surface smoothness improved drastically.
(Click to view full size image)
The head is a Wolverine head from Thingiverse, scaled down to roughly 25mm height. Printed with HIPS. Left side is the standard “fine” profile, right with 0.1mm layer height and reduced outer shell speeds.
Note that the figures were oriented differently when printing: the left one was laying on its back with support, the right standing on its neck (hence the nose overhang not printing well).
Print time goes up of course: 43 min for the left head, 1 hour 9 min for the one on the right.
However, I found that Cura does not slice very thin parts. If a part is thinner than approx 1mm it just disappears, i.e. it does not get printed. Everything looks fine in the “normal” view, but when you look at the “layers” view the thin areas are gone.
I am currently looking into Slic3r as alternative, but haven’t had time to that one going yet.
Please share your findings!