.308 Ammunition Case - Print-in-Place with Bolt-Action Latch

This is a 3D-printed case designed to securely hold 20 rounds of standard .308 ammunition. The click-fit silhouettes ensure a snug fit for any brand or bullet tip style, as long as it uses a standard .308 casing.

Key Features:

• Click-Fit Silhouettes: Each round is held securely in place, even when the case is shaken or bumped. After testing with a few hundred inserted and removed rounds, the design has retained its firm hold. Although wear will certainly occur with prolonged use, it should require a ridiculous amount of regular use before it would wear out.

• Print-in-Place Design: The entire model prints as one piece. The only supports required are already included in the CAD design, so you can simply print and go.

• Sealing Mechanism: The case has a raised profile on one side and a corresponding groove on the opposite side. While not airtight, it provides a dust and grime barrier and aids alignment between the lid and base.

• Latching Mechanism: This case uses a 'bolt-action' sliding pin in the base, which locks securely through the post in the lid when closed. The bolt can be slid forward and pivoted down to lock flush with the exterior, ensuring the case stays closed during transport.

Future V2 Updates:

The next version will include an actual TPU gasket for a tighter seal. My attempts in the current version to include a gasket didn’t perform as intended, so I’m reworking the latch mechanism for better, evenly distributed holding pressure to allow for a good seal.

V2 will also introduce an optional spring-loaded bolt-action latch, utilizing a standard ink pen spring, making it easy for anyone to assemble without special parts. This feature requires minor assembly, so it will not be completely print-in-place like the current version.

Print Time:

• Approximately 7.5-8 hours with the above settings.

Feel free to test different materials or settings, but keep in mind I’ve only tested the design with the above materials and settings. Your results may vary.

If you have made it this far…
I’m currently working towards an engineering degree, and time for extensive model testing and refinement is a bit scarce. As a result, some aspects of the design might not be fully optimized, and occasional oversights will happen. For that reason, this model is and will remain available as a free download. I will continue to make improvements when possible, and any feedback on the model is invaluable and always appreciated.

If you feel the design and final print have met your expectations, a “buymeacoffee” donation would be an appreciated gesture. You can contribute via the link here if you’re so inclined: buymeacoffee.com/overton_prints