Keep it simple,
Put desired amount of weed in multiple mason jars with small hole in lid just big enough to fit butane nozzle and freeze overnight along with butane (separately).
The same jar can be used over for the blasts but 2 makes it a little faster allowing less butane to evaporate
Blast enough butane in 1st jar until butane is level with material (stop once or twice and take butane tip out of jar lid to avoid pressure build up inside jar) and soak in freezer for X amount of time, the longer the soak, the more butane will evaporate. (I like 1 hour soaks)
I like to open the freezer every 10-15 mins to let any butane vapors escape to avoid build up over the course of the soak.
After soak, pour out butane from jar 1 into jar 2 and repeat.......so on and so forth......
I like to do 2 soaks of the material, the 2nd soak is done with new butane and then combined with the first.
Then lid can be removed on mason jar and place unbleached coffee filter over mouth and screw on the ring to hold on the filter and filter into whatever you see fit.
I use a warm bath to reduce and then purge.
IF AT ALL POSSIBLE, THIS SHOULD BE DONE OUTSIDE.
The soak is fine in a freezer indoors as not too much butane is evaporated in the 1 hour but don't get complacent, it is still very volatile!!
