Twelve villager pillager iron farm

An iron farm for twelve villagers and one pillager, based on gnembon's design. The villagers sit in glass pods, the pillager keeps them panicking, and the golems drop into lava above the hoppers. It uses a pillager instead of a zombie because a pillager frightens villagers from a longer range. Java only.

Villagers often will not climb onto the beds, and in some pods only two of the three sleep at a time. A villager that stops sleeping stops the golems for that pod.
Most of the time only one or two golems spawn at once. Flush the golems out faster, or move the spawn platforms further apart so a golem on one platform is not picked up by another pod's villagers.
The design is from an older version. Golem detection has changed since, so it yields less now than the original did.
Use a pillager, not a zombie. A pillager scares villagers from further away, a zombie has a shorter range.