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

thingiverse

Can be printed with just one perimeter.(bottom layers should also be enabled) It contains pellets that are build from the bottom but cannot fall out. This stuff can also be found o-jasper/various_physibles at github. License See at the top of the .scad files. shaker.scad is under Creative Commons Attribution(CC-by), and macara.scad is under CC0 or public domain, whichever you choose. Instructions I printed it with one layer but slic3rs(0.9.10b) avoid_crossing_perimeters got it outside the whole item causing some ugliness there. Of course you could just make vasable-maraca which is basically just a base shape, stop mid print and chuck the noisemarkers in then.. Or have bits you just poke loose.