Why is my printer not excluded from the scan?

Apologies if I've overlooked the obvious.

I am using Nessus 3.2.0 with Client 3.0.0 under XP.  I have created a
policy and have not enabled the 'Scan Network Printers' however on my
test network the printer is scanned and it shoots out 2 sheets during
the scan.

I am leading up to scanning an estate of a few thousand devices, but
would like to guarantee excluding printer scanning as much as
practically possible - is there anyway I can investigate further why
my printer was scanned?

I may be able to exclude the printer IP addresses but they are not
neatly presented within the IP scope, however I could use nmap -O and
parse the results to get the majority of printer IPs.  If I wish to
exclude these IPs do I append them to the
Tenable\Nessus\config\nessusd.rules ,
Tenable\Nessus\users\localuser\auth\rules or both?

Any alternative methods please?

Many thanks
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