Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a Michigan Factory Uses AI to Turn Plastic Waste into 3D Printer Filament
Transcript
- Lucas: There's a factory in Detroit that's trying to solve one of the messier problems in manufacturing: what to do with mixed plastic waste that can't be sorted by hand. Luna: Mixed plastic — that's the stuff that ends up in landfills because separating it by type is too expensive, right? Lucas: Exactly. Most recycling facilities rely on people or simple optical sorters, but they can only handle a few resin codes. This place, run by a startup called ReForm, is using AI and chemical recycling to turn that waste into 3D printer filament. Luna: So they're not just sorting better — they're actually breaking the plastic down and rebuilding it. Lucas: That's the key. The facility processes about 50 tons of plastic per day. First, they run everything through a shredder, then a series of conveyor belts with near-infrared sensors. Those sensors scan each piece and a machine-learning model identifies the polymer type in milliseconds. Luna: What kinds of plastic can it identify? Lucas: The system is trained on about 20 different resin types, including PET, HDPE, PP, and even some that are traditionally non-recyclable like polystyrene. Once sorted, the plastic goes into a chemical recycling process called depolymerization. Luna: Depolymerization — that's where they break the polymer chains down into monomers, right? Lucas: Precisely. They use a combination of heat, pressure, and a solvent to reverse the polymerization. The output is a purified monomer stream that can be repolymerized into virgin-quality resin. That resin is then extruded into filament for 3D printers. Luna: And the economics? Filament sells for around 20 to 30 dollars per kilogram retail. What's ReForm's price? Lucas: They're at about 25 dollars per kilogram right now. That's competitive with premium filaments made from virgin plastic, but they want to get down to 15 to really disrupt the market. Luna: The energy cost must be significant. Breaking down polymers and rebuilding them isn't cheap. Lucas: It's about 8 kilowatt-hours per kilogram of filament. That's roughly double what a virgin filament producer uses. But ReForm offsets about 60 percent of that with rooftop solar and a waste-heat recovery system that captures heat from the depolymerization process and uses it to preheat incoming material. Luna: So they're not just making the product sustainable — they're trying to make the process sustainable too. Lucas: Right. And the filament itself has a lower carbon footprint because it's diverting plastic from landfills. ReForm claims their filament produces 70 percent fewer CO2 emissions compared to virgin PET filament. Luna: Who's buying it? Lucas: Mostly local manufacturers in the Detroit area. They use it for prototyping, jigs, fixtures, custom tooling — stuff that doesn't need to meet strict mechanical specs but benefits from being made quickly and cheaply. Luna: And it keeps that plastic in the local economy instead of shipping it overseas or burying it. Lucas: Exactly. One of their customers is an auto parts supplier that used to order filament from China. Now they get it from ReForm, and the lead time dropped from six weeks to three days. Luna: That's a real supply chain win. But what about the technical quality? Is the filament as good as virgin material? Lucas: That's the big question. In tensile strength tests, ReForm's filament is about 90 percent as strong as virgin ABS. Good enough for most prototyping and non-structural parts. But they're working on improving the consistency because printers are sensitive to diameter variation. Luna: Diameter variation is a huge issue. Even a 0.05 millimeter difference can cause clogs or poor layer adhesion. Lucas: ReForm says their filament stays within plus or minus 0.03 millimeters — that's better than many budget virgin filaments. They use laser gauges at the extrusion line and adjust the puller speed in real time. Luna: So they've got the tech. The challenge now is scaling. Fifty tons a day is a start, but how do they get to the next level? Lucas: They've announced plans for three more facilities by 2028, probably in the Southeast and the Pacific Northwest. But the biggest hurdle is feedstock supply. They need a steady stream of mixed plastic waste, and that means contracts with waste management companies. Luna: And those contracts are hard to get because waste management companies already have deals with traditional recyclers. Lucas: Right. ReForm is trying to position itself as a complement, not a competitor. They take the stuff that traditional recyclers can't handle — the mixed, contaminated plastics that would otherwise go to landfill. Luna: That's a strong pitch. 'Give us your garbage that nobody else wants.' Lucas: And they charge a tipping fee that's lower than the landfill fee. So waste haulers save money, and ReForm gets raw material. It's a win-win on paper, but execution is everything. Luna: Speaking of execution — we've talked a lot about the process and the business model. But if this kind of deep dive has been useful to you, maybe helped you think about a problem at your own company, we should mention something. Lucas: Yeah. This show is ad-free, and that's because of listeners who chip in. If today's episode was worth a coffee to you, you can find us at buy me a coffee dot com slash fexingo. Luna: It's a small way to keep these conversations going. And we really appreciate it. Lucas: So back to ReForm — they're also experimenting with other feedstocks. They've tested filament made from ocean-bound plastic, and they're looking at using agricultural plastic waste like greenhouse film. Luna: That would open up a whole new supply chain. Greenhouse film is a huge problem — it's usually low-density polyethylene, and it degrades in the sun. Lucas: Exactly. If they can crack that, they could tap into a massive waste stream. The global agricultural plastic market is about 6 million tons per year, and most of it isn't recycled. Luna: So what's the biggest thing standing in their way right now? Lucas: Cost reduction. They need to get filament price down to 15 dollars per kilogram to compete with conventional filament at scale. That means improving energy efficiency, increasing throughput, and negotiating better feedstock deals. Luna: And if they pull it off, they could prove that a circular plastics economy is actually viable. Lucas: That's the bet. And it's a bet worth watching.