A dedicated stamp printer is optional, and is only used for printing First Class postage from the Print Stamps tab on the Home screen.
If your label printer is a Brother QL model, you can use it for both shipping labels and stamps, and it will automatically cut the labels down to the correct size while printing.
You can use any supported label printer of your choice as long as you load a roll of 1-⅛" x 3-½" labels. Search for 30252 labels online to find the right size. You can also use 4x2 inch labels, but you might have trouble finding room for them on some envelopes.
The stamp printer configuration process is almost identical to label printer configuration, except that the exact label measurements cannot be adjusted.
Dymo LabelWriter 450 series printers are also supported. If using a Twin Turbo model, PostalPoint will use the left side roll. To change this, in the PostalPoint Advanced settings under Manual Configuration, enter the key dymo_twin_roll_selection and the value 2 (for the right roll), 1 (for the left roll), or 0 (if both rolls are the same and the printer should decide which to use).