Infill Vs. Perimeters. Which Is Better For Strong 3D Prints?

Hoffman Tactical provides an in-depth analysis of carbon fiber (CF) PETG filament for 3D printing, comparing its strength and properties to standard PETG and PLA. The expert assessment highlights that while CF PETG offers increased stiffness and a 25% tensile strength improvement horizontally, it also becomes more brittle. For applications like firearm lower receivers, the recommendation leans towards non-filled plastics such as PLA+ or 3D870 PLA due to their better balance of strength, durability, and heat resistance. Printing with CF filament necessitates a hardened steel nozzle.

This video details the construction and operation of a DIY linear impact tester, designed to measure the impact resistance and toughness of various materials, particularly 3D printed filaments. The tester utilizes a falling mass, an opto-interrupter for velocity measurement, and a shock-absorbing base. By comparing calibration runs with and without a test sample, the energy absorbed by the material can be calculated, providing valuable data for material comparison.

This video details the construction and use of a 3D-printed broaching press designed to create precise hex holes in 3D-printed SL9 bolt hold open levers. The creator explains how inconsistent tolerances in commercially available aluminum hex shafts and the nature of 3D printing led to issues with lever fitment, necessitating the development of this specialized tool for improved reliability in firearm component kits.

This guide details the installation and modification of the Super Safety, an active trigger reset system for the AR-15 platform, developed by Hoffman Tactical. It covers the necessary trigger modifications, component installation, and function checks. The system utilizes a push-button interface and offers a unique 'Active Reset' position for significantly faster trigger resets, as explained by the designer.

This guide details the process of annealing nylon 3D prints to mitigate 'creep,' a phenomenon where the material slowly deforms under sustained stress below its yield point. The video demonstrates how to anneal parts using a filament dryer and then test their creep resistance under load. It highlights significant improvements in creep resistance, particularly with filled nylons, though it notes potential shrinkage during the annealing process.

This guide details the process of 3D printing an AR-15 lower receiver using Carbon Fiber Nylon, based on expert instruction from Hoffman Tactical. It covers essential filament preparation, specific printer hardware requirements, critical print settings, advanced slicing techniques for warp prevention, and post-processing steps. The instruction emphasizes the importance of material science knowledge for successful and durable firearm component printing.

The Ounce Pistol is demonstrated for its rapid-fire capabilities on steel targets. The video details its unique loading procedure via a side door for its 10+1 capacity .22 LR internal magazine and its folding mechanism for concealment and deployment. Expert handling showcases the firearm's specific mechanical nuances.

This guide details the installation and modification of the Super Safety, an active trigger reset system for the AR-15 platform, developed by Hoffman Tactical. It covers the necessary trigger modifications, component installation, and function checks. The system utilizes a push-button interface and offers a unique 'Active Reset' position for significantly faster trigger resets, as explained by the designer.

This guide details the process of 3D printing an AR-15 lower receiver using Carbon Fiber Nylon, based on expert instruction from Hoffman Tactical. It covers essential filament preparation, specific printer hardware requirements, critical print settings, advanced slicing techniques for warp prevention, and post-processing steps. The instruction emphasizes the importance of material science knowledge for successful and durable firearm component printing.

This review delves into the intricate mechanics of the Ounce Pistol, a unique folding .22LR firearm. The presenter provides a detailed disassembly, revealing the complex bolt and barrel assembly, the fixed magazine system, and the innovative long-stroke recoil operation. Key features highlighted include the tilting bolt system, the integrated chamber indicator using the firing pin, and a novel cartridge feeding mechanism.