So I've always saved my coffee filters (the ones used to filter my final product), and utilized the following method to extract every last bit of the good shit from them. It's a simple procedure, but I'm sure someone might benefit from this. I usually dream about 3 boxes per cook, and what I get from this technique always ends up being between .5 and 1g. That's definitely worth saving!
1) take your used coffee filters, fold them in 1/4s and place them into a sandwich sized Ziploc baggie.
2) add about 4mL of distilled water to the baggie, and make sure it soaks all of the filters
3) put a plate on an electric stove/hotplate, and turn the heat up to between 2-3.
4) snip a corner of the baggie and drain all the water onto the plate. Wring out every possible drop
5) evaporate all the water out of the solution, leaving behind a lovely crystalline coating on the plate.
6) use a card or razor to scrape it all into a pile, and enjoy.
Again, this might be common sense to most, but I'm sure someone will get some use from it.