This kinda thing has been mentioned before here on the Nexus but i've ultimately made a few changes and came up with my own way of doing it. All that is required is the DMT-containing plant, washing soda (which can be made from heating baking soda in the oven at 400 degrees for an hour) and the solvent of your choice, though i use 91% to 99% Isopropyl Alcohol (preferably the 99%). I'm sure Naptha could potentially work as the solvent, same with Methanol, of course Acetone, and others.
Step 1 - Brew on up the DMT-containing plant by doing a few boils and filter each boil off into a big pot, combining the boils.
Step 2 - Boil/reduce the brew down and then pour it into a smaller pot to boil/reduce again down to about 100mls or less, but 200mls max.
Step 3 - Once the brew is cooled down (room temp/cool to the touch), toss in enough washing soda to soak up all the liquid, stirring it in and then let it dry. At this point, the brew is dried to the washing soda (and is freebased) and all one has to do then is pull from the dry paste with their solvent a few times.
Step 4 - Pull with the solvent, i usually pull atleast 6 times with warm/heated Iso (i keep the jar with the washing soda/brew paste and Iso on a candle warmer with the jars lid off), then filter off and evaporate the pulls, one of the following two ways. Evaporate the pulls straight onto an amount of some sort of herb, or evaporate the pulls in something that has been weighed beforehand and can be weighed afterwards to determine your yield for which you can then determine the correct amount of herb(s) you'll need... then after determining yield, simply soak the freebase oil back up with some fresh warm solvent and if needed use your finger to mix the freebase oil back into the solvent (and clean your finger afterwards with a little more solvent just incase you have any freebase on your finger) and then evaporate the solvent onto an amount of herb(s).
To put it simply, if for any reason you'd want smokable DMT, it's as easy as brewing on up the plant, filtering it a few times, boiling/reducing the brew down to about a hundred mls or less. Once cooled, toss in enough washing soda so that it soaks up all the liquid, then you wait for it to dry. Then you simply do a few pulls from the dry paste with a solvent and evaporate the pulls/solvent onto an amount of herb(s). It really is that easy.
This gives you freebased full spectrum extract of any DMT-containing plant.
And just as a btw, if for any reason you have any residual base in your end result (like if you're using 91% Iso), one can simply give the Changa a quick water rinse and the base should come on off but the extract should stay in place. Also, when evaporating the pulls you might have some freebase oil stick to the sides of whatever you're evaporating it in, and so i usually just wet my finger with some solvent, and rub my finger across the places where the oil is and then be sure to wash my finger off with a little more solvent. This ensures you get every last little bit that you possibly can.
And for filtering, coffee filters work great