Need Help Roland Flatbed Print Acrylic Slipping

[petepaz]

trying to print 3/8 acrylic on lej 640 flatbed and it's not pulling through. material has paper mask-no good. tried putting application tape on it-no good.
now going to try a card board transfer/jig underneath.
any ideas?
maybe it's just too heavy for the rollers?

 

[petepaz]

made a card stock carrier and it seemed to work. got to the last 3" of the panel and it slipped so going to do a print mount. i am just going to figure the acrylic was too heavy.
i will try cleaning the grit rollers and pinch rollers but they don't really seam dirty. perhaps the pinch rollers need to be replace but i have printed thinner/lighter rigid materials with no problem so i do think the weight was the issue.