How to Build a Minecraft Mob Grinder | Minecraft
Mob Grinder Base. 2. Build a water channel. Mobs fall from the first floor through a 2 x 2 hole in each corner. They fall to the ground floor where a 2 wide by 8 long water channel pushes them to their doom. Water flows over 8 blocks and then stops, but items will carry on and fall if there's a drop at the 9th block.