by CafeT, published
Update: Using an Archimedean spiral approximation, I think this would be about 1.33 ohms in copper, 86.9 ohms in nichrome, 17.4 ohms in lead, 1.65 megaohms in sea water. I imagine this could be raised quite significantly if one could print the resistor in layers along the Z axis (at the same resolution and trace size, 10 times per millimeter).
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DuPont has inks that could be used to print resistors - years ago we did thick film circuits. Resistors were typically screen printed, fired and then trimmed with laser. The same applied to conducting strips. Soldering was achieved by screen printing solder paste on the contact points. Components was either electronically or manually (prototyping) placed - the beauty was the placement did not have to be absolutely accurate as the solder will help to pull it in position on the tabs as soon as that was heated.
Warning on the above - it is also an effective coil.....
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