Thermal paper rolls can be bought at most office supply shops. Make sure that they have these measurements in order to be compatible: 2.25 inch (roll width) x ~80 Feet (roll length) x ~7/16 inch (core)/ 57mm (roll width) x 25m (roll length) x 12mm (core). The diameter of a role should then be around 1 ⅞ inch/ 45mm.
Which paper rolls are compatible and where can I buy them?
