@greener1 Yes, I use pattern mode. Even in pattern mode it I found it to be impossible to make a 50um NEGATIVE feature (hole, slot,etc...) with any sort of real Z thickness.
@alinargt I have tried Vorex Black, Fun to Do Snow White, Maker Juice G+ black, CPS SM472, FormLabs Tough, and Molecule Pt.
My experience so far puts the FTD Snow white at the top of the list for fine features - BUT, you can't use it with the Ember since it reacts with the PDMS so quickly that it clouds the window after a single print.
The next best resin I found for fine features is the CPS PR57K (Normal Autodesk black resin).
Based on my current experiences, if we had a resin with the same cure properties as the FTD but was compatible with the PDMS, we would be able to get to the 50um negative feature.