Originally Posted by
Iowatech
What's happening is that the corners of your paper are wearing holes through the master material, allowing ink to leak through where it isn't supposed to. Being on the very edge of the paper, these deposit ink on the roller underneath the drum, which over time will build up to make streaks appear on the front and the back of your prints.
What you might try is, after fifty or so prints, pull the drum out and look at the master. There should be an impression the size and shape of the paper you are running in the master. Put some tape over the corners of that impression (any single sided tape will do, the Riso won't care) and then run the rest of the prints.
Hope that helps.
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