"He who marches out of step hears another drum." ~ Ken Kesey
Hard water.Try using an air hose after washing the stencil out to clear water out (and water near that might move into the open stencil) before drying it and see if that fixes it.
I do have to say that, though a problem in some areas, I'm sure, I have never seen the minerals in any particular water leave the rainbow sheen that is the characteristic visual of scum.Minerals leave more of an actual powder-like residue, don't they?
I overhear that the printers have "stat started" getting this issue over the last year. I want to help get it resolved.I asked them if they rinse off the inside one last time after washing out the front. They said yes. So, assuming they are doing that and doing it well enough, what other areas of the process might cause this? Not a good reclaim process/scrubbing actions?It's not totally blocked. They can print a few times and push through it to get the print to clear.Thoughts?