Epson TM-C3500 Series Technical Reference Manual page 233

 Do not print inside or within 2 mm {0.08"} around the snap button mounting hole to pre-
vent damage to the mechanical functions.
 If using the WB-S/M/L series, use the attachment (OT-WA34).
 If you enabled "Borderless Printing", printing is done with settings for no margins, but
the printing might protrude beyond the paper/label, depending on the actual print posi-
tion and the set position for the label. To make sure printing does not protrude out,
ensure margins of 1.5 mm {0.06"} or more in the print data.
Chapter 6 Appendix
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