Brother P-touch P300BT User Manual page 7

Accessories
If the cutter blade becomes blunt after repetitive use and the tape cannot be cut cleanly,
rotate and reset the Cutter Board as shown in the illustration (1).
If you still have difficulties, replace the Cutter Unit with a new one (item number: TC4) from
your Brother dealer.
Replacing the Cutter Unit
1. Pull out the two sections of the Cutter Unit (green) in the direction of the arrows shown
in the illustration (2).
2. Install the new Cutter Unit. Unit by pressing the two new pieces down until they lock into
place.
Cutter Board
1
2
Cutter's Edge