The Fabricator is a machine from the XyCraft mod. This machine is used to automatically craft things. It can be controlled by redstone, if that is enabled in the UI. The top setting, and default setting, means that it will craft when there is no redstone signal, and stop when there is. The middle setting means that it will craft when there is a redstone signal, and stop when there isn't. The bottom setting means that it will craft one time per redstone pulse. The left slots are where you input the recipe, while the right slots are the Fabricators internal buffer. Items can be input from the top of the block, and output from any other side or bottom.