If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
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: 4062
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!
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
3D Printed Salt Water Capacitor...
