Epson TM-C3400BK Technical Reference Manual page 32

Receipt
This is continuous paper.
Paper type
Form
Paper width
Paper thickness
Roll paper core
External diameter
Winding direction
Do not use the paper with a hole or cutout.
32
Plain Media, Fine Media, PET Film
Roll paper
30 to 108 mm {1.18 to 4.25"}
0.085 to 0.151 mm {0.003 to 0.006"}
Outside diameter: 44.1 mm {1.74"}
Maximum 101.6 mm {4.0"}
Printing face must be facing outside.