AI replaced 3D printing in composites pitches

In 2019, 3D printing was the loudest thing in composites. Across that year’s JEC Composites Startup Booster applications it ran at 24.7 mentions per 10,000 words of founder text, ahead of every other theme in the set. By the 2026 edition it had dropped to 3.6, the quietest of the eleven themes we counted.

At Sesamers we turned nine editions of Startup Booster applications into a dataset: 1,071 applications filed between 2017 and 2026, 817 companies after cleaning, and all 149 finalists checked one by one against company registries, court records and their own sites. JEC supplied the funding figures from its own tracking of all 150 finalist slots. It shows which themes rose, which collapsed, and how the money tracked the judging. Here’s the decoder.

3D printing was the loudest theme in composites. Then it wasn’t.

One method note, because it changes the answer. JEC’s application form grew from an average of 95 words per entry in 2017 to 536 in 2026, so any theme counted per application looks like it exploded. We counted mentions per 10,000 words of text instead. On that basis, additive manufacturing and 3D printing fell 85 percent from its 2019 peak and finished last of the eleven themes in the 2026 intake.

The companies carry the same story with names and dates on it. 3DFortify raised at least $12.5 million with Lockheed Martin Ventures, RTX Ventures and Accel on the cap table, then dissolved, and VoxelMatters reported on 21 March 2026 that Tethon 3D had bought its materials IP. Arevo raised $104 million from Khosla Ventures, GGV, In-Q-Tel and Defy.vc, ceased operations in 2023, and Stratasys bought its patents in March 2024. 9T Labs raised about $21.5 million and sold its assets, patents and 40 machines to Biwi SA in April 2026.

$138 million. Three asset sales.

Recycling won the slots. Bio-based won the money.

Recycling and circularity language went from 24.1 mentions per 10,000 words across the 2017 to 2019 intakes to 167.3 across 2024 to 2026, the biggest move of any theme in JEC’s files. The juries followed it. Recycling produced zero finalists in 2017 and six in 2025, and across the 2023, 2024 and 2025 editions recycling and bio-based materials took 27 of the 60 available slots.

Then look at what those companies raised.

Recycling and circular composites holds 22 finalist slots over ten years and $33.2 million behind them. Bio-based and sustainable materials holds 23 slots and $680.1 million. One company does most of that work: UBQ Materials alone accounts for $437 million of the bio-based figure. Strip it out and bio-based still runs seven times ahead of recycling, on a slot count one higher.

Slots and money are two different votes.

Carbon fiber stayed flat. The cleanup around it grew.

Carbon fiber mentions barely moved across ten years, 14.4 per 10,000 words in the 2017 to 2019 applications against 16.3 in 2024 to 2026. Everything that climbed sits downstream of it: recycling at 6.9 times, sustainability and CO2 language at 4.1, bio-based at 3.2, hydrogen at 8. The industry kept the material and picked up the question of what to do with it afterwards.

AI and machine learning language more than doubled, 7.6 to 16.6, and hit its all-time high of 20.8 in the 2026 applications. Generic software and digital language nearly halved over the same stretch, 49.1 to 27.6. Founders dropped the words software company and started naming the specific capability. Had we tracked a single bundled digital row, we’d have published a flat line and missed both moves.

Whether AI does to recycling what recycling did to 3D printing is the open question for the 2027 cohort. On the numbers so far it is a long way off. AI’s best year is 20.8 mentions per 10,000 words and recycling runs at 167.3, so this is a thing to watch rather than a thing that has happened.

Finalists outlast the companies that didn’t get in

A finalist slot buys three days of stage time in front of the buyers of your industry, a shortlist your investors can read, and press coverage a seed-stage composites company can’t buy. It shows in the outcomes. On JEC’s tracking, 139 of the 150 finalist slots, 93 percent, are still operating, acquired or merged. Our own registry check of a matched sample of applicants who didn’t make the cut puts them at 69 percent.

Some of that is the jury doing its job. For the 2026 finals JEC seated five senior figures from Safran Corporate Ventures, Airbus, Emerald Technology Ventures, ExxonMobil and Owens Corning, buyers and investors who work in composites for a living, and they pick companies that already look strong.

Two notes on the counting. JEC’s own tracking carries a funding figure for 110 of the 150 finalists, $1.36 billion in total, and it counts grants, public funding and government or EU programmes alongside equity rounds. It also records eleven companies as liquidated, dissolved or gone, which public registries are slower to show. The applicant side of the 93-to-69 gap comes from those registries, so read the gap as indicative.

What to do with this if you’re applying

Entries for the 2027 edition close on 19 October 2026. The 2026 cohort is your reference point: 20 finalists, three winners, all of them listed.

Apply more than once. Of the 797 companies with an application on record, 148 applied at least twice, and repeat applicants became finalists 24 percent of the time against 14 percent for first-timers. A company that comes back has another year of product, customers and proof behind it. That gap is what maturing looks like from the jury’s side.

Put three dates in the diary. Entries close on 19 October 2026, the 20 selected startups are named at the JEC World 2027 Premiere on 11 January 2027, and the pitches run at JEC World in Paris from 2 to 4 March 2027.

Know what you’re competing for. €5,000 to the grand winner, €2,500 each to the runner-up and the sustainability award, a booth at the following year’s show, and no equity taken.

Lead with AI, if you can. The theme hit its all-time high of 20.8 mentions per 10,000 words in the 2026 intake, and the juries have followed a climb like that before: recycling went from zero finalists in 2017 to six in 2025. If AI keeps rising through the 2027 applications, companies solving composites problems with it have a strong shot at the 20 finalist slots.

Disclosure: JEC is a Sesamers client, the ten years of Startup Booster application and funding data behind this piece came from them.