I had to re-install with the latest ISO so I don’t know if anything changed but adding a printer isn’t working.
As per Arch instructions I edited /etc/nsswitch.conf to add mdns_minimal [NOTFOUND=return] and my printer is detected.
I added myself to sys so CUPs works ok and goes through the motions of adding the printer.
I chose driverless (both times I was prompted) and the final response was ‘unable to copy PPD file’. I tried 3 times and 3 PPD files appeared in my home directory.
Googling this problem has implicated the file may be corrupt?