I felt like my mass fabricator was going way too fast, so I did some calculations and testing with it. This is on unleashed 1.1.4 with no changes. The mass fabricator is significantly faster even though there were no changes to it coming from older versions that I know of. This may or may not have been fixed in 1.6.2 versions of IC2. I just don't know, but I still wanted to put this out there. Without scrap,the mass fab needs 1 million EU to make 1 UU matter. Mathematically, a constant supply of 512 eu/t with no scrap being provided would take the mass fab 98 seconds to make a single UU matter. But instead, it's only taking 16 seconds to make one in my testing. It seems like the mass fab is currently bugged and makes UU-matter as fast as if it was being amplified by scrap even though its not. Its going about 6x faster than normal, nearly the same rate that scrap amplifies. I've seen others experience this as well, and for some people, scrap just doesn't even work in the mass fab. You can test this yourself if you so desire by opening the Ultimate pack and the Unleashed pack side by side, generating a world in both of them, plopping down an ultimate hybrid solar on a mass fab with no scrap, and seeing the difference. Some people may not like this, on the other hand, some may love it. I personally think its not really legit if you are getting the benefits of scrap, without even having the infrastructure of producing it. Chances are, this will not be fixed since the IC2 team is working on 1.6. I just wanted people to be aware about this.
So the Mass Fabricator is broken
- Thread starter Geometry
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Unleashed is running IC2 classic, which isn't being worked on anymore. The issue you have found is by far not the only thing that's buggy. 
From 1.6 on there'll only be IC2 experimental, which is actively being developed. The mass fab is one of the machines who got a complete overhaul.
From 1.6 on there'll only be IC2 experimental, which is actively being developed. The mass fab is one of the machines who got a complete overhaul.
gretech mentions using ic2 377 to fix EU-net issues. However there are other bugs in the 377 version that if your running classic ic2 make it unbearable. Basically ic2 for 1.5.x is very very buggy.