On the Ultimaker, pieces of extruded filament fall onto the bottom and your choice is to pick all out by hand one at a time or vacuum it out. But what if you had a small broom and dustpan? I remembered Hairy Lion by primoz_'s design (https://www.thingiverse.com/thing:2007221). What a great idea! I wondered if it could work here to make a broom. Sure enough, it works. The dustpan holds the broom and hangs on the side, ready for it's next cleanup job.