Cause
A lack of margin on the paper leading edge allows the separation plate on fusing roller to catch the paper, which produces an accordion-like jam.
A lack of margin on the trailing edge of paper also allows the separation plate on pressurizing side to catch the paper in duplex printing.
This is likely to occur if:
Using thin paper
Using coated paper
A lot of toner adheres to the paper leading edge due to a solid image
Printing with a narrow margin on the leading edge
A lot of toner adheres to the paper trailing edge due to a solid image
Printing with a narrow margin on the trailing edge having a high magnification rate)
