Abstract: A brake assembly for a personal mobility vehicle, in form of a racing wheelchair, comprises a brake lever for actuating a brake cable, wherein the brake lever is a 3D printed glass filled nylon unit, in particular with up to 30% glass filled nylon. A steering arm assembly comprises a steering arm with the brake assembly integrated into the steering arm A racing wheelchair with one front wheel is attached to a wheelchair frame via a fork, with two drive wheels as well as a steering cage mounted on the rear of the wheelchair frame. The brake assembly and/or the steering arm assembly are mounted to the wheelchair frame.

Abstract: The invention relates to a process for preparing a wheelchair frame (7) comprising: a) preparing parts or segments (4) of the wheelchair frame from a sacrificial material; b) applying a curable lightweight material to the parts or segments (4) obtained in step a); c) curing the parts or segments (4) obtained in step b); d) removing the sacrificial material in order to obtain hollow frame parts or hollow frame segments of the wheelchair made from the curable lightweight material.

Abstract: A concave cell for the collection of radiated light including a body with a concave surface and an unmodified flat surface opposite thereto, and a reflective surface coupled to the body across from the concave surface, said reflective surface including an opening and a photo detector operatively coupled thereto. A method of collecting light by reflecting light inside the concave cell, striking the light at the concave surface, scattering the light at the concave surface, and registering the scattered light with the photo detector. A method of increasing uniformity of light registered in a photo detector. A method of making a concave cell.

Abstract: A concave cell for the collection of radiated light including a body with a concave surface and an unmodified flat surface opposite thereto, and a reflective surface coupled to the body across from the concave surface, said reflective surface including an opening and a photo detector operatively coupled thereto. A method of collecting light by reflecting light inside the concave cell, striking the light at the concave surface, scattering the light at the concave surface, and registering the scattered light with the photo detector. A method of increasing uniformity of light registered in a photo detector. A method of making a concave cell.