But we will have to pursue this at another time, as it is 4 in the morning over where i am.
But if you can, get to where i was telling you about:
there will be a section in there probably nearer to the bottom saying:
Deny From All
Allow From @LOCAL
# Allow shared printing and remote administration...
Order allow,deny
Allow @LOCAL
if it does, that is where the problem is. that is overriding the printer sharing ability. If you remove the: "Deny From All" line and save the file that should fix it, alternatively try resetting that file to defaults.
do this on both computers, and have a look through all the stuff in CUPS.
Talk to you soon
-Joshua Orr