Maximum Compact Machine: 13x13x13 room.The blocks are small rooms, when you right click them with the tool, you transport inside the room. The core item in the mod is the Personal Shrinking Device, serving as the mod manual and the primary tool, as right-clicking a compact machine block will transport you inside it. Compact Machines is a mod introduced to FTB in the direwolf20 1.12 modpack, which allows you to create complex machines in one block.