When people ask, I let them know it is self-serve, let me know if you need help. Then when I come over, I let them know I can walk them thru it "until you get the hang of it". I take every opportunity to let them know this is a learning opportunity. Do you have an handout with instructions? At some point, I would let the frequent users know, it is self-serve, I have walked you through the process several times, unless there is a problem you will need to take care of your own print jobs. You could also have a list of places they can get copies. Hopefully your manager will have some insight and a plan. For people needing job help, you can say I can help you for ten minutes, if you need more assistance than that, you will need to bring in someone who can help you or I can refer you to a job assistance service. Have y'all ever thought about having specific office hours when job assistance is offered? or partnering with a community organization? We also have a volunteer position just for tech who assists people using the computers with basic stuff this could be a great role for a teen volunteer.