[Samba] idmap choice for print server

[calm.job89448 at fastmail.com]

Hi everyone,

I am trying to set up a SAMBA print server as an AD domain member.
In the SAMBA Wiki there's a section about idmap and I have to admit I don't understand what the correct choice for my case would be.
I have a domain controller where all users of the AD are and the SAMBA server should only act as a print server.
Thank you in advance.
Khalid