Hi there,
I hope you are doing fine. I am trying to model an epoxy with the lattice size of 80A^3 and an initial density of 0.2 g/cm3 due to the high energy related to the ring spearings. My question is, after i build the pack and i wanted to start the geometry optimization to get to the real density, am i able to set a target for my final lattice length during the geometry optimization, in order not the cell length be smaller than my target value? 
Thank you in advance guys!