Replacing desktop 3D printers with hand-held 3D-printing pens never quite lived up to the promise of letting users turn sketches into real-life objects. And that’s partly because 3D-printing pens aren ...
[Jack]’s design for a 3D-printable foaming nozzle works by mixing air with a fluid like liquid soap or hand sanitizer. This mixture gets forced through what looks like layers of fine-mesh sieve and ...
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