Epson B 510DN - Manual (Page 209)

Single sheets:
A
C
B-L B-R
Envelopes:
A
B-R B-L
C
Minimum margin
Media type Single sheets Envelopes
A 3.0 mm (0.12 in.) *1 3.0 mm (0.12 in.)
B-L, B-R 3.0 mm (0.12 in.) 5.0 mm (0.20 in.)
C 3.0 mm (0.12 in.) *1 3.0 mm (0.12 in.)
*1 16mm (0.630 in.) when printing folded booklet using the duplex unit
B-310N/B-510DN User’s Guide
Product Information 209