12-Gauge 16x4 Quadloader

thingiverse

Human: Why spend $85 on a 12x4 quad or TWiNS loader when you can print one holding 16x4 for just $0.75? That was my thought process and reason for designing this! Print one central section and the two outer panels; they're identical. This design will securely hold 16 12-gauge 2-3/4" or 3" shells in four quads, and you can also TWiNS load (two at a time) without much difficulty. I've run this design in many competitions with no failures or dropped shells except when I was careless and punched the shells during a rifle transition. It's very secure while running and moving, even fully loaded. The hole spacing is standard for Bladetech Tek-Lok clips or clones of that system; you can modify it as needed. I've slightly undersized the shell clips, requiring about 20 minutes of sanding to achieve the right retention for my shells. You might be able to scale up 2-3% in X and Y in your Slic3r to eliminate some sanding. For stiff shells like Remington #6 Black Shell or Winchester AA, you may need to remove a bit more material. For best results, print with ABS and solvent weld the plates together, or use high-strength nylon alloy and nylon-specific epoxy. My ABS print has shown no signs of wear after thousands of shells.