Because @Yulife is apparently the god of minetweaker (yes even above you @stanhebben ) He requests fuzzy metadata support, even though I argued with him for at least 30 minutes, explaining how If it doesn't work now, It wont work, because IItemStack handles metadata and passes the metadata onto the machines, my guess is that the machines don't handle the meta data, because technically you aren't meant to be able to add recipes to machines.