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Stonehedge
Right, I've ordered one of these powered hubs from PiHut, cheap as chips at £4.50.
Also a 1.35mm 5v power supply, which came from a different online vendor.
I'll have to open up the hub and snip the 5V return line, to prevent back-power to the Pi.
That should see me right, for a total upcost of about £15 including delivery.
Given that Google Cloud Print will end of life soon, I think this device could also usefully act as a CUPS print server.
I need to think about casing for all this, although that seems secondary at the moment.
Not sure if I'll need a fan or not. Hopefully not.