9mm ammo box.  Holds 50 rounds.  Printed in PLA Matte, but you can choose your material.  No supports needed.  If you want you can use a few drops of super glue on the insert tray to hold permanently in place.  On the side of the box you will see the label “PUSH”.  When putting on the cover just latch one side, then pushing on the label named “PUSH” you can snap the other side in.  Reverse to remove the cover.   The cover should last a long time, but if you want a more permanent cover then print the cover in TPU.