Epson Stylus Pro 7600 Reference Manual page 173

2. When attaching a 2 inch roll paper, use the black flanges. To
remove the blue flanges, turn the flange upside down, then
pull the four clips, shown in A to D in the figure below, to the
outside.
D
A
C
B
Note:
Keep the blue flanges in a safe place for future use.
If you want to attach 3 inch roll paper and have to attach the
blue flanges to the black ones, slide the blue flange onto the
black one using the four arrows as guides.
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