Swab sampling robot.
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Previously:
https://www.homemadetools.net/forum/...079#post187706
https://www.homemadetools.net/forum/...705#post186330
https://www.homemadetools.net/forum/...218#post153942
https://www.homemadetools.net/forum/...086#post153531
https://www.homemadetools.net/forum/...168#post153742