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Simplistic, layered iron farm using a modular repetitive build process

Important Points:

1. Do not have any other Doors, Villagers or Villages within 100 blocks of any part of this farm.
2. You should build this farm in your spawn chunks - doing so will mean the farm operates 24 x 7. It doesn't have to be built there, but it's adviseable.
3. The in-game coordinates, show in this video are slightly incorrect due to the way minecraft rounds numbers - Any negative coordinations shown in this video on the game UI need to be one less. In other words, if you see -45 on the screen (in either X or Z) then this in reality is actually -46. This only effects negative numbers (those with a "-" in front of them, and only the numbers shown on the video).  All the other coordinates on this page and discussed are correct and don't need adjustment.

NEW VIDEO: Showing how to update to Version 2 of the farm

NEW UPDATED Version 2: World Download           Old version 1: World Download

Update: 23/11, Hi people, we're still having problems with the Iron Golem's spawning inside the North wall - so do this (three high wall of solid blocks) [should fix it - permanently]:

Update: 17/11, The portal dispenser had a bug. Here's the new layout which solves that problem - The piston shown is a sticky piston:

List of Block ID's and Quantities

The place marker coordinates:
To use the coordinates, simply add them to your coordinates. For example, if you want to build your farm at 250,300 - and you need to know where point 14,-24 is, just add 14 to 250 = 264 & -24 + 300 = 276. So point 14,-24 becomes 250, 276 in your world.

Hopper item numbers (shown in this screen shot):

Here are some screenshots of the minor extra redstone at each door cluster:


Southern Door Cluster




Northern Door Cluster