How to print to a Ricoh Aficio printer requiring authentication?
User codes are setup via either WIM (using the machines IP address in a browser on same network) or on the device itself it is called User code Authentication.

Now you can assign a prompt for a suer code on all services (Aside from printing as this is handled by pacing the code into the 'Valid access' tab on the driver.

On newer models you can edit the driver to force a prompt on the driver to access the user code.

To enable user code auth. see the following:

User Tools/123 key --> System Settings --> Administrator Tools --> Next --> User Code Authentication.

Select User Code Auth.

Select the options in which you require a user code to authenticate.

Press Ok.

Now you need to add a user code, select the previous key.

Address book management --> New Program --> Add a name --> Select the Auth info. tab --> Apply a user code.