Re: Kresty's Dagobah Fusion Generator / Reactor / Furnace - whatever you want to call
For the top coils we used 4' of 20 gauge bronze-ish craft wire (thought copper would be too bright). That's a bit too thin, so I have 1.5mm wire on order. 1.5mm is about perfect (somewhere between 14 and 16 gauge) as I had a color to play with, but it's the wrong color. So, we're waiting for that to arrive from China, but in the meantime we coiled them up by hand.
We wound the 4' of wire on a 3/8" diameter (about 10mm) dowel, and that looks about right to us. It also produces about as many coils as I counted on the photos. It proves to be a bit difficult/tiring to wind, so we ended up putting a screw in one end, attaching the other to the chuck in a drill, and then using the drill slowly in reverse (for the direction I'd been hand coiling them). It worked to hook the wire around the screw to start it, but took a little practice to get decent at it. For the 1.5mm wire the drill technique is nearly required!
Somehow I don't seem to have a photo of the coiling process. I'll try to fix that when the real wires come in.