We recommend using 30252 labels on the DYMO 450. However, we also support using 30334 and 30321 labels.
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Update 12/01/14: Additional label sizes are now supported via DYMO Direct Printing. While in SETTINGS > LIST when you select your printer from the drop-down list, as shown in the video below, you can also choose the label size you want to use (30252, 30334, 30336
or 30321) from the second drop-down.
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