Best riso for 2-colors printing: MZ or V8000

[benoitv]

Hello,

I print a lot of duplex quadtone projects with my riso RP3700, and it would save me quite some time if I could use a 2 colors riso...

what is most important for me is accuracy and registration (print speed doesn't matter as 60 sheets per minute is enough), and I was wondering which duplicopier was the best for this? Is it the V8000 or the MZ range?

Thanks for your help,

Benoit