[Maraca](https://en.wikipedia.org/wiki/Maraca) that can be printed with zero infill

thingiverse

This model prints with only one perimeter (enable bottom layers). It features buildable pellets from the bottom that won't fall out. Check o-jasper/various_physibles on GitHub for more details. The license varies by .scad file; shaker.scad is under Creative Commons Attribution (CC-by), while macara.scad is under CC0 or public domain. When using slic3r (0.9.10b), avoid_crossing_perimeters may cause some issues. An alternative is to print vasable-maraca, stopping midway to add noisemarkers manually or creating detachable parts.