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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
Slava wrote ... BTW... I'm using an industrial grade 3D printer with super high resolution. I don't think water will go through the 3mm thick wall. I'm worried about internal arcing though...
Do you really want a practical, reproducible capacitor? As mentioned before, you can learn more about the printer and material properties with a much smaller and simpler test structure.
Registered Member #518
Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168
I designed it as if it was to be made using injection molding. It's about the same thickness as a beer bottle (often used as a salt water capacitor) ...
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
The more compelling reason to radius your corners is to stop capillary action drawing salt water up to the top, creating a clearance issue, and flashover. Don't forget, your creepage /clearance distances will need to be quite high - probably 100mm or more. And dry!
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
Filament fusion fabrication is rarely solid or else it tends to warp. If you print 1 extruder thickness wide it may leak. Metal electrodes may still corrode. Why not make it circular or hexagonal with a spiral filling?
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
I'd be interested to see if this can allow me to make 3D printed lead acids.. even low quality ones. £49 for a 12Ah 12V, they can go and whistle. Also its quite feasible to 3D print the paste holders as well, and fill them with lead impregnated carbon graphite. The capacity will still suck but hopefully I can fine tune it and match up the good electrodes.
Mg-ion are becoming feasible, also they are a lot safer. 2.7V fully charged, electrolyte is an organic salt similar to lithium. Water getting into the electrolyte is actually easy to fix just by encasing the whole assembly in a hermetically sealed casing similar to a hard drive.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Conundrum wrote ...
I'd be interested to see if this can allow me to make 3D printed lead acids.. even low quality ones. £49 for a 12Ah 12V, they can go and whistle. Also its quite feasible to 3D print the paste holders as well, and fill them with lead impregnated carbon graphite. The capacity will still suck but hopefully I can fine tune it and match up the good electrodes.
Mg-ion are becoming feasible, also they are a lot safer. 2.7V fully charged, electrolyte is an organic salt similar to lithium. Water getting into the electrolyte is actually easy to fix just by encasing the whole assembly in a hermetically sealed casing similar to a hard drive.
The person who wrote the web page you linked to seems to worry about the toxicity of lead; I would be more worried about the acid!
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3D Printed Salt Water Capacitor...
