I want the butane to drip from the extraction column into a dish with freezing cold ethanol in it because I hope that fats and waxes extracted by the butane wouldn't dissolve in the freezing cold ethanol. Thus they could be easily filtered. I'd end up with a pristine absolute extract then.

If the fats and waxes don't instantly clump out I'd put the extract/ethanol mix in the freezer for over a day or so.

I don't like it for initial extraction. Too much effort to have a clean extraction.