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HP Designjet Z3100 Photo Printer Series - The Paper is Not Flat

If the paper does not lie flat when it comes out of the printer, but has shallow waves in it, you are likely to see defects in the printed image, such as vertical stripes. This can happen when you use thin paper that becomes saturated with ink.
Figure : Waves in the paper
  1. Check that the paper type you have loaded corresponds to the paper type selected in the front panel and in your software. To check on the front panel, use the View loaded paper key.
  2. Try changing to a thicker paper type, such as HP Heavyweight Coated Paper, HP Super Heavyweight Coated Paper, or thicker Digital Fine Art papers.