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Problem is either the cartridge or the fuser. Put paper in the manual feed tray(tray 1) Print something. When the paper gets 1/2 way into the printer, open the top cover. Pull out the toner, look down at the paper. If it has the smudge replace the toner. If no smudge, replace the fuser.
I had the same problem, until i went into the maintenence box, click on custom settings and check the prevent paper abrasion, this is designed for thicker paper and stopped it for a week or so, it did come back and so i took the printer back as it was only 4 weeks old.....
There sounds like there is somthing in the path of the printhead. Using a flash light, remove back cover of machine and look for a small piece of paper,etc. Be careful not to jam anything in to th machine. It may take running a thick piece of paper through manually with your hands to remove the object.
Are you sure this is a Designjet 450 (large format printer) and not a Deskjet 450 (portable printer)? The following assumes you have wispy black streaking on the printed side of the paper. If the streaking is on the back side then post more details of the printer model and the issue.
In either case the most likely cause is a buildup of fibers on the underside of the printheads or carriage, causing wisps of black ink to be dragged on the paper when the carriage reverses direction. You can clean the printer as shown at the following (though the details will be somewhat different for the Designjet or Deskjet....).