Also, I would love to see a system that retracts a hot end when not in use
Now that IS a good idea.

I've currently got one printer with a nozzle removed to avoid hassle.
The other printer still has both nozzles attached. But it's a much better built machine and I've never had issues with the nozzle not in use. Plus I use it for dual material prints as well.

Oh and roxy - there is a filament you can print and heat to get metal object :-)
http://3dprintboard.com/showthread.p...rinting-Powder