Re: Does the alfresco community edition have a feature that can implement unique document ID's in the document for each new print of the same document?
Are you referring to estimated effort or how much such a customization would be "worth" e.g. if provided as an addon?
Generating unique document IDs is a pretty simple use case and can easily be implemented, either by using a global node as a counter-holder (using a simple long property) or an attribute (see AttributeService). It'd be a task of maybe an hour for me or half a day to a full day for people generally familiar with Alfresco Java services...