epson 4880 black marks

[ErezAvraham]

hi all

im continuing to play with the 4880 and i tried a 13x19 Harman Photo paper today, its the crystaljet luster RC. i printed a hight key image and in the buttom of the image where there should be no ink i see a few black lines, looks like head marks.
the paper seems to be thin so i dont think its the height
here is a picture, i circled the marks in red

how can i avoid that?
i tried a different image, and still see the marks. i dont have other papers that size yet but on some samples i did with 8.5x11 i did not see any marks
thanks[attachment=17087:marks.jpg]

[duraace]

hi all

im continuing to play with the 4880 and i tried a 13x19 Harman Photo paper today, its the crystaljet luster RC. i printed a hight key image and in the buttom of the image where there should be no ink i see a few black lines, looks like head marks.
the paper seems to be thin so i dont think its the height
here is a picture, i circled the marks in red

how can i avoid that?
i tried a different image, and still see the marks. i dont have other papers that size yet but on some samples i did with 8.5x11 i did not see any marks
thanks[attachment=17087:marks.jpg]

For that paper I set platen gap Wide and thickness 5 on the 3800.

[ErezAvraham]

For that paper I set platen gap Wide and thickness 5 on the 3800.

thanks, i will try that

i tried wide but i didnt change the paper thikness, it seems like on the 4880 the max thickness is 1.5

[ErezAvraham]

For that paper I set platen gap Wide and thickness 5 on the 3800.

one more question, if its the thickness, how come the marks are only on the bottom of the paper?

[Conner999]

ink on ejection rollers?