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Registered Member #518
Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168
Hey everyone! I just 3D CAD'ed a salt water capacitor (Google Sketchup 2015). I have not printed it or tested it yet. I will do that next week when the 3D LAB opens.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Very cool looking. Thank you for sharing.
ESR might be an issue with plates made of salt water.
Do you have any estimates for the dielectric parameters of a 3-D-printed wall? Effective thickness, dielectric constant, breakdown voltage, etc.
You could measure those parameters with a single rectangular wall, which would be much faster and cheaper to print. That would also be the fast way to compare different printable resins (called filaments, right?).
Can you invert the design, so that solid matter and empty space trade places? Then 3-D print the two sets of plates, using electrically conductive filament material (lower rho than salt water), and use oil as the dielectric.
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: UK
Posts: 556
Fused filament 3d prints are usually permeable, as I found out when printing a coffee mug which can only be used as a pen pot due to the fact that any liquid content seeps out. This problem might be resolved in the laser type printing or by getting the printer to extrude more filament.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
I agree that very probably the plates will leak and the capacitor will be a short circuit. Maybe you can adjust the density of the material to avoid leaks, depending on the printing technology. The idea of using conductive filament may work. I have tried to make something similar, but so far all the printings failed. The parts perpendicular to the lateral walls need supporting structures.
Registered Member #518
Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168
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...
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3D Printed Salt Water Capacitor...
