Finely milled material works for CO2 and hydrocarbons, I’ve not been happy with the post processing required when extracted with ethanol.
The cannabinoids are in the trichomes, so opening most of the other cells by grinding mainly adds things you dont want to the extraction.
IMO you’re also going from cannabinoids dissolved in solvent (terpenes in unbroken trichomes), to cannabinoids ppt all over the place once you start breaking trichs open and letting the terps (more valuable than most cannabinoids by weight right now) evaporate.
I turned away 1k lb of biomass last week because it had been hammer milled to dust.
The farmer wasn’t happy, but once he’d admitted that he’d had several other folks also reject that material because of the grind, he didn’t have much room to argue.
I purchased and processed 20lb in front of him to demonstrate the issues involved.
The right grind is critical, and ideally it is the processor who picks that grind.
Edit: in this case it was the processor. Farmer had been working with a CO2 operator who was also pelletizing the biomass before extraction (again, not an obvious win with EtOH. Seems to work for CO2).
Edit: I could probably have fit 30lb of this stuff in my nominal 10lb fuge…and I’ll try cleaning the product up. It might be worth the effort given the increase in throughput.