Easy to print Egg shaker.

INSTRUCTIONS:
Set infill to 0%. Pause halfway through the print and pour salt inside (don't fill all the way up, leave a gap to make sure salt grains don't get in the way of the nozzle). Resume the print.

TIP: instead of salt, you can use basically anything, like sand, fine gravel, dry leaves, beans, seeds or a mixture of those. Experiment with different things to find the sound you like the most.

Any resolution will probably do, but I printed mine with a 0.6 mm nozzle and 0.32 mm layer height ("draft" preset in Cura) to speed up the print.