I had this ridiculous 10kg spool of Push Plastic PLA sitting in the corner of my shop for about four years. It was literally collecting dust, and yes—there was cat hair in there too, because the cats live here. I’d been avoiding it for two reasons: I didn’t know if old, open-air PLA would still print well, and I didn’t even have a way to feed a spool this big into a printer. After I talked with Josh (the plant manager) at the Push Plastic factory about whether you really need to dry PLA, he offered to send me a proper spool holder—and that’s what kicked off this experiment. In the video I set up the big spool stand, then added a simple inline filament cleaner (a little clamp that sandwiches sponge around the filament) to catch dust and debris before it could make it into the extruder and cause a jam. I ran the spool into my Elegoo Centauri Carbon using an outside feed and watched closely to see if the printer could actually pull filament smoothly without under-extrusion, false runout errors, or—worst case—dragging the machine onto the floor. Then I printed a Benchy, my go-to kitten model (great for spotting overhang and “tuft” issues), and a few stacking storage bins. Using the default PLA profile in Orca Slicer, the results honestly shocked me: the prints looked clean, consistent, and even had a bit of shine. Verdict: this dusty, four-year-old PLA printed way better than it had any right to.