So an orthodontist wants me to be able to print models to make Essex retainers for him. He wants to pay $30 a piece with other orthodontist in my area I might be able to get around a 100 per month any thoughts if this is a good idea?
Greetings Earthling! Welcome!
If you already have the printer and are up on all the stuff of getting the file from him to the end result of a saleable model, go for it, you're looking at something that you can do with no additional outlay with the equipment and knowledge you already have. Less collecting dust time for the printer. Just watch your material consumption per model.
Otherwise, you may have a hard time getting them outsourced for the quality you'd want to associate yourself with at a price point that after shipping would not be a loss.