E-bikes are becoming increasingly lighter and in addition very quiet. During operation, there are hardly any motor noises to be heard. However, resourceful inventors, such as Lars Hartmann from Reichshof, are not content with that. The bicycle chain's background noise was too loud and a thorn in his side. A metallic chain sprocket served as a guide roller for the chain to prevent it from colliding with the frame, but caused tremendous operating noise. In search of a remedy, he remembered the offer by
igus, which he had seen at a trade show: the
3D printing service , which manufactured individual components cost-effectively with a 3D printer.