A rotatingly drivable filament cutting head for a trimmer, having a basic body on which a cutting filament is held. The cutting filament extends from outside the basic body through an opening into an interior region of the filament cutting head open to the surrounding area. A stop is arranged on the filament cutting head, so that, in a first position of the cutting filament, the stop delimits a filament portion of the cutting filament, which is insertable into the interior region, to an insertion length. A deflection element is arranged in the interior region so that the cutting filament can be switched from its first position, without the cutting filament being longitudinally displaced, into a second position. The cutting filament abuts against the deflection element in its second position and the stop does not delimit the length of the filament portion which is insertable into the interior region.