Before coming to the nexus I was evaporating off my solvent at the end of the pull to get the crystals out, now I'm freeze precipitating the out with good effect.

Question - feezing out the naptha was done after about 2/3rds had evaporated. Lots of people say this is a good idea. But why evaporate any? Why not save all of the solvent by freezing for longer, making the procedure more efficient?

Thanks.

It has to do with saturation level. If the solvent isnt saturated enough, only a small amount or none at all of the dmt will crash even if leaving for long in the freezer. Check this explanation and this FAQ question maybe it helps understanding a bit more

by the way, naphtha is not a polar solvent, its NON polar...