Cobblestone to Netherrack [ FARM ]
It was supposed to be for my single player world, but i made it pretty compact 11x7, works like a charm.
You need to feed it Netherwart and Glistering Melon Slice and does the job. The machine has a cobblestone farm and on/off clutch.
Don't forget to WATERLOG the Stair beside the lava because it s not saved in the schematic file.