I advised this trial version user to post a question here as there's an issue with his printer settings or possibly the output settings in Photoshop that is scaling the image down.
He does not have a RIP and has converted the separation to bitmap halftones. He has now written back and states the image size problem has been resolved although when he tries to print the separation, the same film keeps printing out.
Since I have no idea how this can be, I have instructed the trial version user to Split The Channels followed by outputting each as a standalone document. That's usually a cure-all for all printing issues with bitmap conversions.
I'd like to add that whenever I receive a question on outputting to film, the term always used is "UltraSeps won't print". The fact which eludes many, especially those newer to Photoshop and color separation is there's nothing special or specific about separations generated by UltraSeps. They're simply generic multichannel PSD files. No secret formula to hinder film output is used.
How to output to film is the most often asked question I receive and although I have documentation and video's out the wazoo regarding film output, for some reason, the trend continues although its not as frequent as when compared to years ago, during the time Adobe removed the print variables from Photoshop beginning with CS5.
BTW, I do my best to send as many printers as I can to this forum. Not sure the number of which that actually signs up and participates.