The GROMIT Magnetic Mag Holder
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Administrative Magnetic Magazine Holder for IDPA / USPSA
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- Other Sports
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
OVERVIEW
This project is a simple magnetic magazine holster intended for carrying a make-ready magazine or other non-retention-critical applications such as USPSA competition. The design combines a rigid PETG inner body with a TPU outer shell to provide structural rigidity while protecting the magnet assembly from impacts and wear.
The holster uses inexpensive off-the-shelf hardware and mounts using a Mini 2-Hole Tek-Lok compatible pattern, making it compatible with a wide range of competition belt attachment systems.
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MECHANICAL COMPATIBILITY
Item | Status | Notes |
|---|---|---|
Glock 9×19 magazines | Tested | Factory magazines and extended magazines |
Glock .40 S&W magazines | Tested | Factory magazines |
Glock .357 SIG magazines | Tested | Factory magazines |
Glock .45 GAP magazines | Tested | Factory magazines |
Glock 10 mm Auto magazines | Tested | Factory magazines |
Glock .45 ACP magazines | Tested | Factory magazines |
Extended Base Pads | Tested | Fully loaded 9 mm magazines with +5 aluminum extensions from Henning Group and Taran Tactical Innovations (TTI) |
Magazine Orientation | Tested | Functions with cartridges facing either toward the body (“bullets in”) or away from the body (“bullets out”) |
Mounting Pattern | Verified | Mini 2-Hole Tek-Lok compatible |
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DESIGN GOALS
Goal | Engineering Rationale |
|---|---|
Simple construction | Minimize hardware count using commonly available components. |
Fast magazine access | Eliminate mechanical retention for applications where rapid access is preferred over retention security. |
Durable construction | Separate structural and protective functions by using a PETG core with a TPU outer shell. |
Easy maintenance | All hardware is removable and replaceable without reprinting the entire assembly. |
Flexible compatibility | Support the full range of Glock pistol magazines using one common design. |
This holster is intended for competition and administrative magazine handling. It is not designed as a retention holster for duty, field, or concealed carry applications.
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SPECIFICATIONS
Item | Specification | Status |
|---|---|---|
Inner Material | PETG | Verified |
Outer Material | TPU | Verified |
Magnet Diameter | 32 mm (1.26 in) | Verified |
Magnet Type | Countersunk Neodymium Cup Magnet | Verified |
Fasteners | M4 Socket Head Cap Screws and M4 Hex Nuts | Verified |
Recommended Screw Length | 6–10 mm | Verified |
Mounting Pattern | Mini 2-Hole Tek-Lok compatible | Verified |
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BILL OF MATERIALS (BOM)
Qty | Item | Specification | Optional | Recommended Source |
|---|---|---|---|---|
1–2 | Countersunk Neodymium Cup Magnet | 32 mm (1.26 in), approximately 110 lb pull | No | DIYMAG (Amazon) or equivalent manufacturer |
2 | M4 Socket Head Cap Screws | 6–10 mm | No | McMaster-Carr, Misumi, or local hardware supplier |
2 | M4 Hex Nuts | DIN 934 | No | McMaster-Carr, Misumi, or local hardware supplier |
1 | Belt Attachment | Mini 2-Hole Tek-Lok compatible | Yes | Blade-Tech or compatible manufacturer |
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PART TYPES / COMPONENTS
Part | Function |
|---|---|
PETG Inner Body | Supports the magnet, carries structural loads, and provides the mounting interface. |
TPU Outer Shell | Protects the magnet assembly, improves durability, and absorbs minor impacts. |
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ASSEMBLY
Print the inner body in PETG.
Print the outer shell in TPU.
Install the magnet(s) into the PETG body.
Press the M4 hex nuts into the printed hex pockets.
Secure the assembly using M4 socket head cap screws.
Attach the completed holster to a Mini 2-Hole Tek-Lok compatible belt mount.
The printed hex pockets are designed as a light press fit. If necessary, gently tap the nuts into place before installing the screws.
Fastener length is not critical. Any M4 screw between approximately 6 mm and 10 mm that provides adequate thread engagement without bottoming out should function correctly.
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MAGNET CONFIGURATION
Configuration | Recommended Use |
|---|---|
One Magnet | Most steel-bodied magazines |
Two Magnets | Glock polymer-bodied magazines |
A single magnet provides adequate retention for most steel-bodied magazines. Glock magazines benefit from a second magnet because the polymer body reduces the amount of exposed steel available for magnetic attraction, resulting in lower holding force.
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RECOMMENDED PRINT SETTINGS
Setting | Inner Body | Outer Shell |
|---|---|---|
Material | PETG | TPU |
Nozzle Diameter | 0.4 mm | 0.4 mm |
Layer Height | 0.20 mm | 0.20 mm |
Wall Count | 4 | 3 |
Infill | 25–40% Gyroid or Cubic | 100% |
Supports | None | None |
Print Orientation | As Modeled | As Modeled |
Brim | Optional | Optional |
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TESTING / VALIDATION
I tested the holster using factory Glock pistol magazines in every currently produced caliber, including 9×19, .40 S&W, .357 SIG, .45 GAP, 10 mm Auto, and .45 ACP.
Testing also included fully loaded Glock 9 mm magazines equipped with +5 aluminum magazine extensions from both Henning Group and Taran Tactical Innovations (TTI). The two-magnet configuration securely retained these magazines during normal movement and range use.
The design was tested in both common competition orientations, with cartridges facing toward the body (“bullets in”) and away from the body (“bullets out”). Both configurations functioned without modification.
Retention recommendations are based on practical range testing rather than instrumented pull-force measurements.
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FUTURE DEVELOPMENT
Future revisions may include additional mounting patterns, support for alternative magnet sizes, and variants optimized for additional magazine families. Broader compatibility testing with non-Glock magazines will be performed as additional platforms become available.