mmm interesting concept 
how does that work? Did you put the portal next to the crucible and than you connected all the portal next to the mold to it? Glad to hear that you are planning something to use more molds! that would be very nice
Edit: Im not really sure how you pour the metal from the cucible to the portal
Edit2: I fugured it out i was using the wrong side
Edit3: It works with sensors as well. It just works like an universal extender. The only problem is to use this with multiple crucible. It will be tricky to link them in the correct way