Robert- I'd be happy to talk to you about my (limited) experience with making digital negatives, but that's off-topic for APUG. Suffice it to say there are a lot of printers that will work, but there are some that are preferred greatly over others. Same with media. Ron Reeder has produced a couple of books on the topic that are quite good - I'd look them up and do some reading before investing in a printer. As with any method, there are some calibration steps you have to go through that are rather tedious. Without following those steps, you will not be any more successful with digital negatives than you will be with doing analog enlargements.