A Few versions ago i discovered this bug that if a crafting recipe has a crafting time of less than 1 game tick, no energy or ingredients are required to produce the product. While this is not achievable in vanilla, in mods such as Dytech or Bob's Mods, which add very fast machines and additional modules. This allows for creation of items that you may not even be able to craft the prerequisites for, which i would say is probably not intended . This works on assembling machines and mining drills (and probably some other things, but I haven't tested). Has anyone else experienced this or is it just me? I have a decent computer, so I doubt that it's lag.
I am playing on version 0.12.7, but I first saw the bug in 0.12.4. I am operating Windows 7.