This mag pouch started off as a remix of user haakon1's IPSC Glock Magazine Pouch, which fits Glock 17/19/26 mags.

I have taken his design and rebuilt it in Blender with some changes. This version fits M&P 9mm double stack mags. I use it for 17-round mags in my 1st gen full size M&P 9 and it works great. It has adjustable retention/hold on the magazine, adjustable cant angle, and a locking mechanism that ensures it doesn't spin or rotate on the belt. The mag pouch attaches to any belt easily, including MOLLE-style inner/outer combos like what I'm using. It is designed to use minimal, inexpensive, and easy-to-source hardware. I have used these pouches in numerous competitions, and they are durable and show no signs of wear.

The design was also optimized to be easy to remix in Blender (Blender file is provided). Most double stack mags are similar in size, but this design relies on having fraction-of-a-mm perfect inner dimensions for the fit to land in the narrow window between "too loose to retain the mag effectively" and "too tight to fit the mag in." If you want to try this design, but shoot a Glock, CZ, Beretta, Springfield, Canik, H&K, etc., or even something like a 1911 with a single-stack mag, let me know. If you can provide me exact measurements of the dimension of your magazine, I am happy to see if I can modify the design to fit your mag without requiring changes in hardware. In theory, it should be possible to remix for other mags in a matter of minutes - simply drag the walls in or out as needed for inner dimensions to match the size of the mag.

##Printing Guidelines

For each complete mag pouch assembly, you will need 1 each of "v4_Gear (PLA).stl", "v4_Mag_Pouch (PETG).stl" and "v4_Belt_Attachment (PETG).stl".

I use a standard 0.4mm nozzle and 0.2mm layer height for all parts. Print the PLA parts as you normally would with at least 50% infill. Print the PETG parts with a hot nozzle (I use 240 C) and very low or no parts cooling. 50% gyroid infill, with 3 walls and 4 top/bottom layers is ideal here. Printing PETG with low/no parts cooling maximizes the strength of the print, and its resistance to splitting or failing along layer lines. The design relies on having a little flex and tension on the part, so a strong print and good layer adhesion is a must. All parts have been optimized to print without rafts, brims, or supports, even with parts cooling disabled. Just make sure you have good first layer adhesion and a level bed.

I have not tested the mag pouch or belt attachment in any material besides PETG. I believe PETG is the sweet spot for this design between rigidity and flexibility/toughness. PLA would likely wear out quickly due to the "compliant mechanism" nature of the design, and possibly shatter. TPU (even stiffer flavors like 98A) would probably feel too "floppy" for my preferences. Both TPU and PLA start to soften at lower temps than PETG, potentially causing problems at competitions in hot climates.

Optionally, you can print 1 of "v4_Thumb_Screw (PLA).stl" as well. In combination with hex-head screws and a little superglue, this allows you to easily attach and remove the mag pouch from a belt without tools. The design will work just fine using only the 3/8" pan head screws, but you'll need a screwdriver to lock the belt connector to the belt (or remove it).

Print everything in its native orientation to avoid the need for support material.

##Bill of Materials:

You'll need the following parts to assemble each mag pouch assembly:

• (2x) #6-32 x 3/8" pan head machine screws (Bolt Depot catalog #1335). Metric equivalents will probably not work, as metric nuts tend to be smaller in outer diameter than imperial. Feel free to remix if you can't source imperial machine screws.
• (3x) #6-32 hex nuts (Bolt Depot catalog #2558)
• Optional: (1x) #6-32 x 1/2" hex head machine screw (Bolt Depot catalog #15819, they refer to them as "tap bolts"). An additional #6-32 x 3/8" button head screw can be substituted here. Using the hex head machine screws simply allows you to screw in and out the locking mechanism that holds the belt attachment to the belt without tools, which is nice when you're at a match and want to reposition a mag pouch on the belt.

##Assembly

1. Insert a nut into each nut retention cavity on the prints. There are 3 in total.
2. Use a #6-32 x 3/8" pan head screw to attach the mag pouch to the belt connector, with the gear in between the two parts. Set the desired cant angle of the mag pouch, and tighten the screw down very firmly. The gear between the parts should completely prevent any rotation after the cant angle has been set and the screw tightened.
3. Use a #6-32 x 3/8" pan head screw to set the holding tension of the mag pouch. With a magazine in the pouch (preferably fully loaded so the weight is accurate), tighten the screw in the retention tab until the holding tension is where you want it.
4. If not using hex head screws and "v4_Thumb_Screw (PLA).stl" for tool-free installation and removal of the mag pouch assembly on the belt, use a third #6-32 x 38" pan head screw here. Simply hook the belt connector over the belt or through the MOLLE straps on the belt, and use a screwdriver to lock it in place. This can be done while wearing the pouch if necessary. You are done!
5. If you want tool-free installation and removal, onto the belt, then install the #6-32 x 1/2" hex head screw into "v4_Thumb_Screw (PLA).stl" by adding a dab of superglue into the hex-shaped cavity in the print, then pushing the hex head screw through the hole until the head bottoms out against the plastic. This thumbscrew can now be used to easily install or remove the belt connector with attached mag pouch from the belt.