Canon PIXMA iP 3300 User Manual page 65

Envelopes
Use either European DL or US Comm. Env. #10 size envelopes.
Important
Select either DL Env. or Comm. Env. #10 in the printer driver according
to the envelope size you are using. If you do not, the address will be
printed in the wrong direction.
Preparation for Printing
1
Press down on all four corners and edges of the
envelopes to flatten them as shown below.
2
If the envelopes are curled, hold the opposite corners and
gently twist them in the opposite direction.
Make sure that the flap of the envelope is perfectly straight.
3
If the leading edge of an envelope is puffed up or curled,
use a pen to press the envelope flat and sharpen the crease.
Press the envelope completely flat, working from the middle to the edge.
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