A simple filament runout sensor made from re-used Ender 3 endstop. You gain the endstop by upgrading to an ABL probe.

This remix is built on the OG model, just wanted to have a “floating” version of it, as my setup doesn't allow me to use the original bracket. Use of PTFE tubes and screws is similar.

Print from anything, watch out for soft filaments, help to guide them through with some tweezers.