To starts off, this is NOT my design and I am not taking credit for it. I found this design on docm77's channel (he does many cool tutorials go check him out!). The farm has a total of 4 spawning pads and a collections area that is automatic. It's a simple design that I created to make it automatic, all I did was weaken them in the transport canals and then let them drop into a lava pit. This isn't the most efficient farm in 1.6.2 because in this update they changed some of the spawning techniques and the way they spawn. But, this farm still gets around 48 to a stack of iron ingots in half an hour or so.

If you would like to see more and check out the server it was built on, the ip is: 66.85.149.218:28084
If you do come on just say that Nomad8 sent you.

If you have any thoughts or suggestions on how to make it more efficient, please let me know!