This tool lets you take bundles of 1mm fiber optics and light them up with addressable LED strips. This supports anywhere from 1-7 fiber strands per LED.

To use you'll need two copies of the block holder (you can choose how many LEDs by editing the OpenSCAD source below), some wire ferrules (parts listed in the link below), hex ferrule crimpers, and the mating blocks. Details below:

OpenSCAD Source and complete instructions: https://github.com/xxv/fiber-optic-driver