Tri fold magazine loader for 5.56/.223/300 AAC magazines, all capacities. 9 .stl files in all, the largest of which will fit onto a ender 3.Functions well, I've made 3 myself, using PLA. I like to use 30% infill, with supports on to support the small shoulders over the track.I also print the pins laying flat on the build plate, so the layer lines are perpendicular to the diameter. This will prevent breaks along the layers.depending on your printer, you may find that you need to clean the pin holes in the hinges and panels out with a 1/4" (6.35mm) drill bit, gently.