Board Thread:General Discussion/@comment-31632066-20170727105444/@comment-31028364-20170727124919

Only by purchase at all three stations. I opened them up when I first started playing by spending my rubies. I have all three open. Helps when you need to craft cotton and dragonflies. I usually have all three doing the stones first and then the Inventor to craft either both cotton/dragonfly or one of each. Personal preference.