In the [printers] share, you do not have a path option.
When a print job arrives at a Samba server, the print data needs to be written to disk.
Add the following line.
path = /var/spool/samba
Also, I noticed you did not have a 'hosts allow', although I don't remember if the default is denied all.
example: hosts allow = 192.168.1. 192.168.2. 127.
Consider reading the SMB HOWTO
http://www.linux.org/docs/ldp/howto/SMB-HOWTO.html