2020 / Ender 3 Filament Guide With Runout Sensor

I like having a filament guide, but I wanted it to also act as a filament runout detector and put some tension on the filament so I don't get backups on my spool, which can cause tangling.

I started with this: https://www.thingiverse.com/thing:2917932

Print this thing so the hole is on z, standing up, and the arm lays flat.

I designed it so that it doesn't need supports to print.

You might have to drill out the filament hole, particularly if you get a lot of elephant foot or overextr