What kind of Servo or actuator to use for diy filament cutter?

I'm currently looking into upgrading one of my old printers with a filament cutter since filament ramming gives me headaches. It's supposed to be controlled by the printer but I don't find a clear answer what kind of servo or actuator to best use (which is both lightweight but also strong enough). I still have some servo pins available on my board, no stepper though.

Can someone give me a hint what to look for?