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The Mass Fabricator is an advanced machine from IndustrialCraft2 that requires 1,000,000 EU to generate UU-Matter. This material can be crafted into almost any basic (ores, etc) item in Feed The Beast.
Scrap will greatly increase the speed and reduce the cost of the fabricator by 6 times. Scrap is consumed in the process: A total of 34 scrap is needed to create one piece of UU-Matter at maximum efficiency, reducing the required energy to 166667 EU. To produce enough scrap to run the fabricator constantly, you need one Recycler for every 17.86 EU/t input (approximately). Scrap can be fed automatically into the fabricator through the bottom side. Both scrap and Forcicium have an amplifier effect of 5000, while using a Scrap Box has an amplifier effect of 45,000. The UU-Matter can be extracted from any side.
Currently, this and the Terraformer are the only IC2 machines capable of accepting High Voltage from an HV-Transformer or MFSU directly (some GregTech machines can also accept HV power). If your mass fabricator is far away from your power source, this would be ideal. However, keep in mind that inadvertently using the Extreme Voltage side of the HV Transformer will cause an explosion of considerable force, similar to a Nuke (half the radius in uniform blocks).
Sending a redstone signal to the mass fabricator will stop it from working and consuming power.
The Mass Fabricator is disabled by default in Feed The Beast Modpacks that include the GregTech mod, where it is replaced by the considerably more expensive and slower Matter Fabricator. The Mass fabricator can be reenabled in the GregTech configuration file. To do this, you will need to go the FTB folder on your computer. Go to 'config', then to 'Gregtech' and then finally open the 'Recipes' file. There you can change the "Mass Fabricator = false" statement into 'true' and it will be enabled. If you want to do this on a server, you need to change it in the server config files, and everyone who plays on the server has to adjust his or her config files as well.