There are a few things that you can do with the wax capping derived from strained honey. I also save the Burr comb that I scrape each inspection. There are tons of things that you can make from Beeswax. But I am thinking that homemade foundation might be the safest thing to use in the hive. After all, there is no way of knowing the condition of the hive or Bees that made the wax from manufactured foundation. In theory, it could pass on American Foul Brood or even European Foul Brood. Some of my friends are making their own foundation... This isn't the only way to do this..youtube has jillions of vids about it.