If you're a BC pipe user, there is an easy solution that changes depending on what minecraft version you're on:
1.5.x: Connect an insertion pipe to the matter fab then attach a void pipe to the insertion pipe.
1.4.7: Connect a diamond pipe to the matter fab + place your amplifier item (probably scrap) in the diamond pipe's GUI in the color coded row that corresponds to the side of the pipe connected to the matter fab. Then attach a void pipe to the diamond pipe.