Best solution for printing art for screens?

I work at a medium/large screen printing shop that prints about 50,000 garments per year.

We currently use a Canon iP8720 with an All Black Ink system from Freehand Graphics to print our separations. However, the printer just crapped out on us and can apparently only be fixed by sending it to a service center. We don't have time for that. This is the third printer in 2 years and it is becoming extremely frustrating.

How does everyone else print their transparencies? What issues, if any, do you come across in doing so?

We need a more permanent solution, as everything we have tried so far is not working. We are at our wit's end. Any help is greatly appreciated!