Speedily reload the Nerf Gryphon "Stapler" by Captain Slug, the high-powered blaster with a flip-open integral clip.

This blaster totally rules, but delicately lining up darts in the heat of battle is a nightmare. Perfectly deposit eight rounds at once with this lightweight, quick-printing speedloader. You can print half a dozen of these in less time than a single Talon mag.

Print one Part A and one Part B, preferably out of a material with high layer adhesion like ABS. Both sides need brims, but not supports. Once printed, just snap the two sides together.

The trade-off is that it loads one fewer dart than the clip's capacity, because of the little fingers that grip the darts. I could never fit the full ten darts in there in the first place, which is why this holds eight. I suppose you could remix the Stapler itself to have a longer mag...

Fusion 360 source: https://a360.co/3Db3d8Q