Below are sample GPO settings for all kind of printer installations just for your reference:
Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options\Devices: Prevent users from installing printer drivers - Disabled
Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options\User Account Control: Detect application installations and prompt for elevation - Disabled
Computer Configuration\Policies\Administrative Templates\System\Driver Installation\Allow non-administrators to install drivers for these device setup classes - Enabled
Allowed device setup class GUIDs:
{4d36e979-e325-11ce-bfc1-08002be10318}
{4658ee7e-f050-11d1-b6bd-00c04fa372a7}
For more information, please also refer to the following link:
http://technet.microsoft.com/en-us/library/cc770453(WS.10).aspx
Source : Technet
See more: System-Defined Device Setup Classes Available to Vendors