This plug goes into the hole on the top of the tevo little monster.

The "base" piece has a filament guide (use a M4 nut and thread a piece of PTFE tube into it) and a cable guide that has holes for zip-ties.

In addition you can print the "bridge" and the "trigger", which will form a filament runout sensor when paired with 2 cylindrical neodymium magnets (6mm dia, 3mm long). These go into the circular cutouts and need to repell each other. You also need an optical endstop (i got an additional one with my little monster.

Link to demonstration: https://youtu.be/KufdQlAwSP0

I took inspiration form this:

youtube.com/watch?v=zJ26DD9tk6w

and this:

youtube.com/watch?v=asSLjLGlSrw