I have a whole bunch of spools of plastic around the house with like 1m of filament left, I'm working on burning them off by printing little things, like these washers.
@RueNahcMohr@f4grx Some prints, you can just get away with feeding one after the other into the extruder. But I've always fused them (with a soldering iron, then trim off excess) and never really had trouble.