HP 1100A - Manual (Page 43)

EN Printing on both sides of the paper (manual duplexing) 43
Printing on both sides of the paper
(manual duplexing)
To print on both sides of the paper (manual duplexing), you must run
the paper through the printer twice. You can print using the paper
output bin or the straight-through output path. HP recommends using
the paper output bin for light-weight paper. Use the straight-through
output path for any heavy media or media that tends to curl when
printed, such as envelopes and card stock.
● Manual duplex using the paper output bin (standard)
● Manual duplex (special) heavy-media, card stock
Note Manual duplexing can cause the printer to become dirty more quickly
and reduce print quality. See “
Cleaning the printer ” if the printer
becomes dirty.