How to Invest in 3D printing

What is the 3D printing (additive manufacturing) theme?

3D printing, also called additive manufacturing, builds a physical object by adding material layer by layer from a digital design, instead of subtracting material the way machining does or forcing it into a mold. The 3D printing theme groups the public companies that sell the printers, the resins, powders, and software that feed them, and the services that print finished parts on demand. The technology spans cheap desktop polymer printers all the way up to industrial metal systems that fuse titanium powder with lasers for aerospace and medical parts. The investable theme is really about that industrial end: the machines and services that let manufacturers produce complex, low-volume, or customized parts faster and with less tooling than traditional methods. It is a small and specialized corner of the industrials and technology sectors, not a broad market like cloud or semiconductors.

How do 3D printing companies make money?

There are three broad business models in the 3D printing theme. Hardware makers such as 3D Systems (DDD) and Stratasys (SSYS) sell the printers themselves, then earn recurring revenue from the proprietary materials, software subscriptions, and service contracts that go with them, similar to a razor-and-blades model. Materials and software specialists like Materialise (MTLS) sell the resins, powders, and the design and workflow software that make the machines useful across industries like dental and medical. The third model is on-demand manufacturing, where companies like Proto Labs (PRLB) and Xometry (XMTR) run the machines themselves and sell finished parts: a customer uploads a design and receives printed or machined components, often within days. Those services businesses tend to have more diversified revenue because they are not dependent on selling a big capital machine, which is part of why they have generally been more resilient than the pure hardware names.

Why have 3D printing stocks struggled?

Many 3D printing stocks soared during the 2020 to 2021 retail and SPAC boom on expectations that additive manufacturing would quickly disrupt mass production. That timeline proved far too optimistic. Adoption in real factories has been steady but slow, the addressable market is smaller than the hype implied, and most pure-plays kept burning cash without reaching durable profitability. As interest rates rose and speculative growth names sold off, the sector deflated sharply: 3D Systems (DDD) and Stratasys (SSYS) trade at a small fraction of their 2021 levels, and several SPAC-era entrants were acquired, restructured, or went bankrupt. Desktop Metal, once a high-profile name, was bought by Nano Dimension (NNDM) in 2025 and its operations were later wound down, so it no longer trades. The survivors are leaner and some, like the on-demand services names, are growing again, but the theme remains small-cap, volatile, and sensitive to industrial capital spending.

What gets a stock into the 3D printing theme?

Revenue meaningfully tied to additive manufacturing: makers of polymer or metal 3D printers, the resins, powders, and design software that feed them, or on-demand manufacturing marketplaces that print parts for customers. Diversified industrials with a real additive segment can qualify even if printing is a minority of their business.

What stocks are in the 3D printing theme?

Every public name that fits the 3D printing thesis, with the rationale for inclusion. Click any ticker for the full stock guide. The basket above starts equal-weighted; you set your own target weights inside Walnut.

How to invest in 3D printing

There are a few ways to get exposure to the 3D printing theme, and Walnut is not an investment adviser, so what follows is descriptive rather than a recommendation. The most direct route is buying individual stocks that fit the thesis, but be clear-eyed that these are mostly small-cap, often unprofitable companies, and several hardware pure-plays such as 3D Systems (DDD) and Stratasys (SSYS) trade far below their 2021 highs. Some investors prefer the on-demand manufacturing names like Proto Labs (PRLB) and Xometry (XMTR), whose services models have generally held up better than the printer makers, while metal-printing names like Velo3D (VELO) and the consolidated Nano Dimension (NNDM) remain higher-risk turnaround stories. A passive alternative is the PRNT ETF, ARK's 3D Printing ETF, which spreads a single purchase across roughly four dozen additive-manufacturing companies worldwide, including some large diversified industrials, so you are not betting on any one printer maker. The tradeoff is that PRNT dilutes the pure-play exposure and has itself been a poor performer through the post-2021 downturn.

The third route, and the one Walnut is built for, is constructing a dedicated 3D printing basket. You describe the thesis to Walnut's AI assistant (for example, 3D printing spanning hardware, materials, and on-demand services), and the assistant proposes a set of constituents drawn from names like DDD, SSYS, MTLS, PRLB, and XMTR, along with suggested target weights and the rationale for each. You review every constituent and weight, adjust anything you want, and then fund the basket through your own existing broker. You approve every order before it is placed; Walnut never trades on your behalf. Because this is a small, volatile theme, many people who build such a basket size it as a deliberately small satellite position rather than a core holding, but that sizing decision is entirely yours to make.

The bottom line on 3D printing

3D printing is a genuine industrial technology with growing adoption in aerospace, dental, and medical, but the listed pure-plays are small-cap, often unprofitable, and many trade far below their 2021 highs after the SPAC-era hype unwound. Treat it as a high-risk, deliberately small satellite tilt rather than a core holding, and understand that the on-demand services names have generally held up better than the hardware makers.

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