I built this furnace so that I could easily cast 3D printed parts into exact cast metal replicas. With it I have cast high tolerance machine parts that required zero machining directly from 3D prints. Here is our documentary demonstrating the complete Lost PLA process with this furnace: http://www.thingiverse.com/thing:82176Download the PDF. Note that any image in the PDF is enlargeable if clicked (and you are online).Note that this is more of an "instructable" than a "thing", but I think based on my successful Lost PLA 3D printed castings that it hopefully will have wide appeal to this community.I have documented the Lost PLA process used with this furnace design here (as featured on hack-a-day): http://3DTOPO.com/lostPLA.