this is a fun subject .....and thanks for this ware down the last bit of my mind for the day .........please if anything i am saying is wrong please correct me (learning is fun)
rosin method ........low heat and pressure to press out the resin on a screen....food grade vegan ok new 100% no solvent method
RSO method ........ good method if u are in a state where can get 195% everclear ideal as it is food grade oil
Co2 method...........sub or super critical both are effective tho costly set up high grade oils ...food grade too
BHO method........depending on the rig used and gases great stuff ....not food grade(unless use N-butane)
ISO method ..........alot like RSO but not food grade
now most ppl at home are using the tube method with a silk screen over it .....personally i like a smaller micron screen gives me more choices with what i want to do with it
1 grind the material
2 pack the tube
3 place the screen over the tube
4 put the tube in a plastic bag and place in freezer for several hours (the bag is so frig does not stink like weed for weeks)
5 get a no stick silicon tray to spray in (u need to find a pot that tray can sit in u want it to be large enough so the tray can touch hot water)
6 fill your pot with water to lvl and put on stove heat until just before boil
7 put the try on top of pot and move it all outside to work
8 add in 1 shot glass (25 mls) of 99%iso to the tray
9 get your butane ready .....as what to use u want N-butane (for the longest time u had to order from england they now have a usa supplier it is refined enough to be used as food grade)
https://www.puretanebutane.com/
10 take the tube out of the freeze
11 blow 2 cans of 300ml n-butane tho the tube (1 oz 28.5 grams of bud or trim) into the tray with the iso floating on top of water about 190F
12 cover the tray with a screen fine mesh and clean (keep bugs and other things out but lets gas out )
13 walk away for 30 mins
14 collect the tray and put it on a electric skillet set to warm to purge it out more
15 wait 20/30 mins
16 stir it around and leave it for 20 more mins
17 collect it
it should be heat stabilized with the iso in the tray ........when it cools it will harden will take temps 85 90 to make it flow again
the freezing of the tube is critical as it helps keep chlorophyll out of the butane .......hence the dewaxixng column on rigs .....as u can see the cost of good gas is so much it is best to buy a close loop system passive or active