Another update with some good news! It took quite
some effort, but I finally managed to finish the 11 cell WFC.
Since the 3D print of the blueprint design did not work as expected, I started from scratch with a cilinder (ø150mm) of POM-C material (see post above). I extruded the cavities holding the electrodes with a vertical drill. It was a bit tricky to get watertight everywhere, some O-rings (Ø=131mm, thickness=2.5mm) did the job eventually. The tube caps are 3D printed.
The top cap is also POM-C material, the O-ring is cut to size with Ø3mm.
The electrodes are 316L stainless. The provider was 'Salomons metals
' in the Netherlands, and had them cut the inner and outer electrodes cut to size. Through a friend I had the inner electrodes tooled in a machine workshop. The exact measurements of the electrodes are as close as possible to Stan's...Inner:
Cilinder AISI-316L stainless Ø 12.70MM (1/2"), height: 102mmOuter:
Tube AISI-316L stainless Ø19.05mm (.750'') with a tickness of 1.65mm (About 0.07mm ticker than Stan's based on the blueprint), height: 70mm.
The electrical connections:
Stainless springs: Alcomex
Pressure spring RVS ø 0,40x2,50x9,60 mm - article number DR920
The stainless bolts, allthread and watertight washers: rvspaleis.nl
Cable socket: found onallekabels.nl
I had to make some adjustments on the bottom of the cell, as I, in an attempt to match the blueprint as close as possible, extruded too much material for the holes to be watertight. So I had to glue some extra material on top of each hole. Consequently, I need larger allthreads to make the connections. So beware of not making this mistake if you decide to build it yourself this way. It was a bit of a mess at some point, but I'm quite satisfied with the end result. Now to make this thing produce some gas...
Any remarks or suggestions are always welcome. If you want to build this thing and need some advice: feel free to ask.
Last but not least, I'd like to thank everyone for all the info shared in this thread. I would not have been able to build this without your help. You guys rock!