Myth #7: AM will replace conventional manufacturing. AM has disrupted and forever changed several niche manufacturing applications, including in-the-ear hearing aids, dental restorations, orthopedic implants, orthodontics, and environmental control system ducting for aircraft. However, AM will not displace conventional manufacturing methods for high-volume, low-complexity parts any time soon. Think of common mass-produced items, such as injection- molded stadium seats, trash cans, and disposable drinking cups, or the ubiquitous 12-ounce aluminum beverage containers. These products will continue to be made by conventional methods because it is much faster and more cost- effective to do so. Myth #8: AM can print guns. Of all the media attention AM has drawn, the most unsavory has been the hype around the 3D printing of guns. Here are the facts: some noncritical parts of a semiautomatic rifle were made on a 3D printer. The gun broke after it was fired six times, which confirms the premise that a plastic 3D printed firearm does not hold up to the heat, impact, and ballistic energy of rapid firing. The gun is more of a danger to the person shoot- ing it than to anyone else. The US is the most heavily armed country on the planet, with about a third of the world’s guns, so market demand for a new way to manufacture guns simply does not exist. Also, we know of many ways (e.g., basic machine shop tools and materi- als) that are better for making gun parts. The focus on 3D printing guns is a red herring, and the media and AM industry would be well served to move on to more productive subjects. Myth #9: Every household will own
a 3D printer. This assumption draws on the parallel between personal computers and 3D printers. There
was certainly a time when the claim that every household would have a computer was met with skepticism. However, the analogy for 3D printers simply does not hold up. Before computers, people would write, publish, communicate with
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