I've been working on a little side project that started out as a simple loading block for my .300 BLK brass and turned into something considerably more versatile. This is a completely free tool for my fellow reloaders, I get absolutely nothing from it besides gratification from making something useful.
Rather than making a bunch of individual STLs for different cartridges, I built a fully parametric loading block generator in OpenSCAD and published it on MakerWorld.
Here's what it does:
25 cartridge presets, covering common rifle, pistol, and revolver cartridges, with dimensions derived from SAAMI specifications
Fully customizable dimensions for wildcats, obscure cartridges, or whatever else you're working with
Dual-stage holes designed to accommodate empty cases in either orientation—mouth-up or mouth-down
Adjustable hole counts and layouts, including rectangular and staggered patterns
Bambu Lab printer selection, with automatic build-plate sizing and fit checks
Optional recessed caliber labels and adjustable block dimensions
2×2 fit-test mode, so you can check the fit on your printer without wasting filament on a full-sized block
The whole thing runs through MakerWorld, so you don't need OpenSCAD or any CAD experience to use it. Just pick your cartridge, choose your configuration, and generate a printable model.
I've printed and physically tested the .300 BLK and .38 Special versions, including both case orientations, with excellent results. The other cartridge presets are dimensionally derived and still undergoing physical fit validation.
This has been a really enjoyable project, and I'd love to get some feedback from fellow reloaders and 3D-printing enthusiasts.
In particular, I'd love to hear:
What calibers are missing?
What additional customization options would be useful?
Any bugs, features, or additional calibers your like addressed, now that the base code is laid down under the hood it's super easy to tweak.
Here's the model:
https://makerworld.com/models/3484544
Hope some of you find it useful. And if you print one, I'd love to hear how it fits your brass.
Cheers!