Because I have to place the spoolholder on left side and its not possible to mount the fileament sensor on left side too, because the cable is to short I built a simple guide that prevents the filament from scratching on the edge of the top frame profile.
(I print most of my models leftside/front, so it its optimized to guide the filament there)
There is no need to use the sensor as long you do no huge projects and wont run out of filement - so no real use on 99% of prints.
Update: because it happened a few times, the the filament escaped from hole, I did an update - 2nd version depending on your situation
The author marked this model as their own original creation.