The Nether Reactor from Minecraft: Pocket Edition was scrapped in Version 0.12.1 of the game, but with the power of papercraft, you can still make one in the real world!
(With two blocks per page, approximately 9 1/2 pages will need to be printed)
Building configuration can be found at http://minecraft.gamepedia.com/Nether_Reactor
Click on the papercraft design image.
Make sure it has not been resized by your browser (you might need to click the image again).
Print using your browser's Print function.