Minecraft wiki entry for Witch_farming, associated text: This design by JL2579 also uses shifting floors, but the design for the floors is outdated and no longer works. However, it should be possible to take design aspects from the previous video to make it work again. The use of tripwire to immediately shift the floor helps to ensure that the mob cap doesn't limit the efficiency of the farm. The video also provides recommendations for lighting caves to empty the mob cap further.