3D printing a SQUID detector. SQUID stands for, superconducting quantum interference device. They can detect extremely faint magnetic fields, applications include monitoring brain signals and geophysics, hunting for ore deposits.
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phys.org
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Physicists invent printable superconducting device
Superconducting devices such as SQUIDS (Superconducting Quantum Interferometry Device) can perform ultra-sensitive measurements of magnetic fields. Leiden physicsts invented a method to 3-D-print these and other superconducting devices in minutes.