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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.
https://www.thingiverse.com/thing:1698397
https://www.aliexpress.com/item/3DSWAY-3D-Printer-Part-Material-detection-module-for-Lerdge-Board-1-75mm-3-0mm-filament-detecting/32796458815.html
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.
http://forums.reprap.org/read.php?1,599640,606852

Please advise. Thanks.

Microswitch filament runout sensor
by eussrh

After further research, it appears an Octoprint plugin offers the best solution.
http://plugins.octoprint.org/plugins/enclosure/

I found FILAMENT_RUNOUT_SCRIPT "M600" on latest Marlin 1.1.
http://marlinfw.org/docs/gcode/M600.html

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