The cutter unit that mounts on the carriage unit is disposable.
Replace the cutter unit when it gets dull.
1.2.5 Roll holder
The roller holder accepts paper tubes having inside diameters of both 2 and 3 inches. It is furnished with attachments for 2- and 3-inch diameter paper tubes.
The roll holder clamps the paper tube of a roll not exceeding 150 mm in outside diameter from the inside.