Holds a few hundred 2.5" filters for the Aeropress, my favorite coffee maker. Has a plunger to keep them from taking to the wind, but is designed to let you just pull one filter out at a time.  

Two pieces. Prints without support, though I used rafts to keep the bottoms from peeling up (probably not necessary). I printed the plunger with 25% infill so that it would have a little mass to it (also probably not necessary).