Mar 9 2016
I found a set of nozzles on ebay.
They been supposed to fit on up mini / makerbot style hotends but…
… the UP mini nozzle (on the right) had a much bigger hole (3.5mm) inside since my UP mini has a metal pipe which inserts in the nozzle (good solution to avoid friction caused by bad drilling):
Note: You need to use different slicer and G-Code transcoder in order to use the much smaller nozzle. Maybe also possible with FixUP3D but might need a lot of tuning all the parameters.