Epson ColorWorks C6500Au Technical Reference Manual page 217

Winding direction
Black mark position
Black mark width
Black mark length
Black mark interval
*1: If the gap is 3 mm or less, you need to adjust the detector.
*2: Any other marks should not be placed in the blank between pages.
• Paper with holes or cutouts cannot be used.
• Set the cut position to a position at least 1.7 mm away from the black mark of the next label.
Print side must be facing outside (facing inside is unusable)
18.4 mm or more away from the side edge baseline
18.4 mm or more
4 to 25.4 mm, 4 mm or more of blank space on label
The same as the gap between pages*2
Appendix
217