The garbage bin...I'm not wasting storage space keeping a few grams of material, nor am I wasting time on useless models that I'll eventually throw out anyway.
I've had tailouts catch in the reverse Bowden tube a few times, I'll run as far as I can and then scrap the remainder, can cause issues even with one of those encoder filament sensors. I do try to collect it, want to start recycling material myself at some point.