Must be glitching then. I've crafted it, placed it, removed it...
Quote from chocolote25
Um, unless a secret update has happened that I don't know about, it's a 3X3 (It takes eight (8) redstone inlay to make, if that helps) setup is in an predominately water biome (Oceans, rivers, and swamps come to mind, but mods may add others), it's raining, and you throw the materials into the redstone circle (Make sure that it doesn't land on the Redstone inlay).
As for Speleomantes, I have some questions:
I don't really know anything about actually useful stuff, but what version are you using? That may help smarter people assist you. Also, what are those blue tools in your inventory? They look very pretty.
Quote from Mithion
You are likely in Peaceful mode.
Quote from qmagnet
I don't think you can do it for 1.5.2 in the new launcher.