Filament detection ?

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How do you handle end of filament detection?
Do you end up with lots of unused wasted filament in spools to avoid running out of filament?

I am new to Mendel90 and almost finished printing with my first 1 kg PLA spool.
My 1st 3D printer is a 3DWOX that has a filament counter and a microchip inside filament cartridge to estimate end of the filament.
I do not see any filament sensor for Mendel90.
However, I see such sensor available today.
Would that work with Marlin firmware to enable automatic pause? If yes, which pin to connect?
I noticed this feature for Marlin was discussed 2 years ago. I wonder what is the current status.

Please advise. Thanks.

Microswitch filament runout sensor
by eussrh

After further research, it appears an Octoprint plugin offers the best solution.

I found FILAMENT_RUNOUT_SCRIPT "M600" on latest Marlin 1.1.

Now I need to figure out how to update my firmware to 1.1 with my existing Mendel90 custom configurations....