I thought he meant he had some alu profile and some rails lying around that he was going to use. Made sense to me.
I had looked at a 3d printer a while ago as well and might still go for it one day. I have downloaded the dxfs for the replicator frame and I am currently working on modifying them to be cut from 10mm acrylic on the router. Need to remove all the slots and pins and add screw holes.