Dymo LabelWriter 450 Duo Label Printer Quick Start Manual page 8

Slide the spool guide onto the right side of the spool and press the
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guide tightly against the side of the label roll, leaving no gap
between the roll and the spool. See Figure 6.
To ensure proper feeding of labels during printing, the label roll
NOTE
must fit snugly against both sides of the label spool, with no gaps.
Insert the label spool into the slot in the printer cover with the labels
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extending from underneath the roll. See Figure 7.
Align the left edge of the label with the left edge of the label feed slot
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and insert the label into the slot. See Figure 8.
The printer automatically feeds the label, stopping at the beginning of
the first label.
If the printer does not feed the labels, make sure the
first label is fully inserted and then press the form-feed
button.
If the first label on the roll is not a full label, press the
form-feed button to eject the partial label.
Slide the label guide to the left until the label guide aligns
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with the right edge of the label. See Figure 8.
Make sure that the label guide does not pinch the label.
Carefully lower the top cover.
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6
Figure 7
Align labels
against left
edge
Figure 8
Figure 6
Slide label
guide against
labels