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I changed my mind on using optical for the filament detector since clear filament might be an issue. I think this idea below would be awesome if the bowden tube press in fittings could be threaded into each side.

Octoprint has a runout sensor plugin that runs to the Gpio of the raspberry pi.

I am thinking similar things about the extruder location. i am half tempted to just stand up a 3rd pillar to bolt it to.

Microswitch filament runout sensor
by eussrh