3D printed covers for the Velorian turn signal system for bicycles (https://velorian.de).
The rear cover is held with two cable ties. You can cover the electric distribution on the two rear lights, now.
The signal wire enters the housing from the bottom.
The cable end covers are simply plugged on the hex nuts SW13 that fix the lights.

The rear holder BHW3 is a supplier part that comes without cover leaving the wires open.
I made the front holders by bending a 15x2mm aluminium profile to a 90deg angle and attach them to a standard water tube clamp.