The most commonly used printer by our customers is the Dymo 4XL (or the newer Dymo 5XL).
A number of other companies such as Zebra and Brother also create label printers suitable for MyPost Labels.
Some customers also just use their standard printer with A4 size labels.
If you are looking to purchase a thermal label printer, ensure that it is able to print A6 size labels (with a width of at least 100mm)