SWIM has been recently experimenting with extraction methods, use in e-cigs, and legitimate store-bought vapes. SWIM rigged drilled a hole down the middle of an approx. ~5/8" long bolt in a diameter suitable for the butane canister to seal against it and spray (Important- make sure the bolt's threads are just slightly larger than the ID of your tube)a. Then, 3/8" ID stainless tube was cut down (in order for a small "test batch") and one end was drilled/tapped to accept the bolt. At that point, a coffee filter followed by a square of window screening was attached to the open end (after it was packed with the material to be extracted) and those filters were attached with a hose clamp. Used very little material but had a successful extraction. Going to pass on the freezer ideas for condensation and freezing the base material, SWIM might give that a try in a few. . .