[Hampshire] USB switches

Hi All

Like most of you, I have a few computers and need to share a couple of
printers and an external HDD. None of the computers is on all the time so I
do not want to rely on it to do hosting / sharing - are there any USB
switches that people can either highly recommend or avoid at all costs
please?

Only constraint is I do not want something that runs from the mains all of
the time. Driving stuff from the router is not an option either.

Thanks

Ed

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Ed