This is a 9mm ammo box I designed that holds 50 rounds. Im pretty new to the design process so this could probably be improved upon. rotate the files so that they are laying flat. the lid clicks into place every 10 rounds. 

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.

I am printing on an Ender 5

Thank you and happy printing!