Snaplock 9mm Ammo Box + Expanding Tray

Updated version of my expanding ammo trays

… now with a snaplock box for more secure transport. The original model can be found here.

Update 2026-05-17: Alternative stackers

Check out these stackers if your collection of boxes is growing: https://makerworld.com/en/models/2815670-ammo-box-stackers#profileId-3134704

Update 2026-03-19: V2 Released

Made a few improvements. After making several 100 round double-wide boxes with the original Snaplock face design, I really began to like the way they look when stacked. Some user feedback also led to improvements in the hinges. More contact points and a hole to insert some filament to help maintain alignment. Side cutouts are also elongated for symmetry.

Fat fingered people rejoice!

Yeah, I have fat fingers. I don't like wasted space either. But I have to compromise when most ammo storage solutions that are compact and take up less space make it difficult to pull the rounds out of the trays. This expanding holder lets you store and transport your ammo in compact form factor while giving you the flexibility to expand the trays for easier loading and unloading.

Design features:

• Store your ammo in a tight and compact package
• Expand the rows to get your fat fingers in there for easy extraction
• You can easily store bullets primer up or primer down
• Trays are easily removable.
• Latches and be customized in the slicer with caliber and bullet weight
• Inner label is larger allowing more text.
• Room behind inner label to store original manufacturer packaging like LOT numbers and load details.
• Trays are compatible with my earlier design and can be used in either box.
• These Snaplock boxes will stack on top of the original boxes.

Stacking ring is optional if you don't need that feature. Or glue them in place on the bottoms:

Inner label lets you store original packaging details like Lot Numbers or powder charges.

I started with the parametric Snaplock V1 box originally created by @Hugo but have added my own improvements.

Assembling the hinge:

There is a groove on the underside of the hinge on the bottom half of each box. You slide the lid half hinge into those grooves to assemble the hinge. It can be a tight fit, but once you get it started just advance it a small bit on neach side until it drops into place. A piece of filament can then be inserted in the hole of the hinge to keep everything aligned.

Check out the other pistol and rifle calibers in this collection: