When should I change the knife?

The life of a knife depends on its use. A knife that is mainly used to cut glitter or fashion film usually wears out faster. We therefore recommend using two knives. One for the standard HappyFlex films and one for special films or paper. Often a worn out knife, which does not show a clean result when cutting flex film, can still be used very well for cutting special films such as glitter, flock or even paper. As the standard knife is available in two colour variations (the blue one is often called textile knife), you can buy a blue and a black knife to have a visual distinction. One colour for flex film and one colour for all other films. Or you can make a different optical mark, e.g. with a permanent marker.