This is probably very simple but I can't fathom it out.

I have two printers set up using CUPS and shared via samba:

[printers]
comment = All Printers
path = /var/spool/samba
browseable = no
printable = yes
guest ok = yes

Now I can print from all workstations except one, a new user. That one
user gets 'Access denied'. It's not the pc as I set myself up as a user
on that pc and it works fine.

Can anyone point me in the direction of the access control file for
printing?

TIA