Dot matrix printer cartridges had one really useful thing I miss a lot: when stripped out they contained all sorts of nifty gears, wheels, spacers and springs.
I can't count the number of times these, cleaned up, painted and arranged artfully, have been included in my Wonkhammer 401K vehicles and model railway scrap heaps or foundry wagon loads.
Even the cartridge casings had neat details that could be scavenged. One type were great for perforated "metal" covers for improvised Orc strongpoints, trench reinforcing and IG Vehicle radiator grill applique armour.
There's nowt scavengable o' that sort in a laser or inkjet's leavings.