This is an ammo box I made for .223/5.56 rounds. Its a pretty simple design, but it works. It holds 50 rounds and the lid snaps into place every 10 rounds. Im newer to the design process so im sure this can be improved upon. 

My Print Settings:

Layer Height:        .2

Wall Line Count:   3

Infill:                         15%

Infill Type:               Cubic Subdivision

Print Speed:           70mms

I recommend enabling retraction to help with stringing inside of the holes for the bullets, but you can save a lot of print time if you disable retraction.

Rotate the ammo box so that the holes are facing up

I am printing on an Ender 5

Thank you and happy printing!