Do you mean it is showing lines on the paper itself or it is "crinkling" the paper when it feeds?
Thank you for the information.
Try reducing the amount of paper in the tray to 1 piece of paper and printing. Does it still wrinkle?
Take a look here: http://support.brother.com/g/b/faqend.aspx?c=us&lang=en&prod=mfc9340cdw_all&faqid=faq00000231_045
The model is 9340 on the page but should be extremely similar to your 9330. Please try the steps listed to see if it will fix the issue-- the page has pictures as well to help you through it.
Please let me know if that fixes the issue otherwise if you can take a minute and use the rating system to rate our session as 3 stars or higher and press Submit so I am credited with helping you.
How old is the printer?
Unfortunately, in this case, you will need to contact Brother technical support for repair. Brother should be able to provide you with the cost of repair and you can determine if the cost of repair is worth it or if it is cheaper to purchase a newer printer.
Please call 02 8875 6000
If you can take a minute and use the rating system to rate our session as 3 stars or higher and press Submit so I am credited with helping you.
I am not sure if you saw my last reply but here it is again: