It didn't make 3D printing bigger. It made it smaller - down to a scale most machines can't see.
Exhibit A: the microArch S150, a desktop machine that prints parts smaller than the period at the end of this sentence. It looks like an office appliance. It behaves like a microscope with ambitions.
Somewhere right now a working surgical endoscope tip is taking shape inside a quiet box on an engineer's bench. It is barely larger than a grain of rice and laced with channels and features too fine to machine. No mold was cut. No tool was ground. A pattern of ultraviolet light flashed onto a tray of resin, and a layer the width of a few microns hardened into place. Then another. Then a thousand more.
That box is a Boston Micro Fabrication printer, and the company has spent a decade making sure those flashes land exactly where they should. BMF is not trying to print houses or car parts. It is trying to print the things that are hard precisely because they are tiny - connectors, microfluidic chips, optical components, medical parts measured in microns. The whole pitch fits in one stubborn idea: in manufacturing, smaller is the hard part.
The numbers that matter at BMF all point downward - microns, tolerances, feature sizes. The growth, conveniently, points the other way.
The problem they sawMake a part small enough and the usual options start to misbehave. Micro injection molding can do it, but it wants a steel tool that takes weeks to cut and tens of thousands of dollars to justify - a cruel tax on anyone who only needs a few hundred parts, or who isn't sure of the design yet. Micro machining can do it too, until the geometry gets complex enough that no cutter can reach. And conventional 3D printers, for all their freedom, simply blur out below a certain size. Their resolution runs out before the part does.
So engineers in medtech, optics and electronics lived with a familiar bind: the smaller and more intricate the part, the slower, costlier and less flexible their manufacturing became. Prototyping a micro part could mean waiting weeks to learn a design was wrong. The bottleneck wasn't imagination. It was the gap between what could be designed and what could actually be built at that scale.
The bet was placed in 2016 by Chunguang Xia, Xiaoning He, and MIT professor Nicholas Fang. Fang had been working on the optics behind a technique called Projection Micro Stereolithography - PuSL, if you'd rather not say it twice. Instead of dragging a laser point across resin, PuSL projects an entire patterned image of ultraviolet light through a precision optical system and hardens a whole layer at once, in a single flash. Shrink the projected image enough and you can resolve features down to a couple of microns.
The founders' wager was that this lab technique could become a product line that engineers would trust for real parts, not just demos. That meant solving the unglamorous things: motion platforms accurate to the micron, calibration that holds, resins that behave, and software that turns a flashing light into a repeatable process. The science was elegant. The bet was that the engineering around it could be made boring enough to rely on.
Milestones // 2016 - 2024
A timeline that reads less like a rocket ship and more like a tolerance spec - steady, deliberate, allergic to overshoot.
The productBMF's machines all wear the same family name: microArch. The S-series spans resolution tiers - roughly 2, 10 and 25 microns - so a customer picks the trade-off they need between fineness and build speed, with part tolerances landing somewhere around plus or minus 10 to 50 microns. In 2024 the company added the D1025, a hybrid that can mix two resolutions inside a single print, even within one layer, so you can spend detail where it counts and speed where it doesn't.
A printer is only as good as what you can pour into it, so BMF also sells the resins: tough engineering plastics, high-temperature formulations, an optically clear material that passes more than 90 percent of light, biocompatible grades for medical work, and even a ceramic. The business model is the familiar razor-and-blades of industrial hardware - sell the machine, sell the materials, support it globally - with contract printing for customers who want the parts without the printer.
Printers across 2, 10 and 25 micron tiers for prototyping and short-run production of micro-scale parts.
Industry-first hybrid printer mixing 10 and 25 micron resolution in a single print to balance detail and throughput.
Projection Micro Stereolithography hardens a full resin layer in one flash of patterned UV light.
Tough, high-temp, biocompatible, ceramic and BMF Clear (>90% light transmittance) materials.
The skeptic's question is fair: nice technology, but does anyone need it? The customer list answers in industry logos. TE Connectivity prints high-resolution electronic connectors on BMF systems. Ambu and Pristine Surgical work in single-use medical scopes. Bic, Sonion, Tessy and HRL Laboratories show up across consumer, hearing-device and defense-adjacent work. By the company's count, machines sit in more than 200 locations and parts ship to over 2,000 customers in roughly 35 countries.
The money tells a parallel story. BMF raised a $43 million Series C in 2022 and a $24 million Series D in 2023, led by Shanghai's Guotai Junan Securities, for a total approaching $90 million. The Series D was earmarked for two things: a Research Institute in San Diego and deeper collaborations in medtech - which is to say, more reasons for surgeons' tools and lab chips to start their lives as a flash of light.
Approximate feature scale, microns (shorter = finer)
Illustrative scale comparison; bar lengths are relative, not linear. A human hair runs roughly 70 microns; BMF resolves features down to about 2. The point isn't the exact ratio - it's which end of the ruler BMF chose to compete on.
A bar chart where winning means having the shortest bar. Counterintuitive, much like the company.
The missionBMF frames its purpose as giving engineers "complete design freedom at the microscale." Strip the marketing and it's a real promise: the part you can sketch should be a part you can make, even when it's the size of a poppy seed and riddled with internal channels. That freedom is what micro molding and machining quietly take away, one tooling quote and one impossible geometry at a time.
CEO-Global John Kawola has described the next phase as "an era of self-driven innovation" - the company hunting for applications that only its technology makes possible, rather than waiting to be asked. It's an ambitious posture for a firm whose entire product is invisible to the naked eye. Then again, ambition has always scaled independently of size.
The devices that define the next decade keep getting smaller and more intricate at the same time - minimally invasive surgical tools, lab-on-a-chip diagnostics, denser electronics, miniaturized optics. Each one needs parts that are tiny, complex and made in modest quantities, which is exactly the corner where traditional manufacturing strains. If that future arrives, the bottleneck BMF set out to remove only gets more crowded, and a machine that prints reliable micron-scale parts on demand stops looking niche and starts looking like infrastructure.
None of this is guaranteed. Micro 3D printing is still a young, contested market, and BMF competes against the likes of Nanoscribe and against the inertia of molders who've done it the old way for decades. But the company has done the hard, unglamorous work of turning a clever optical trick into machines that 2,000 customers will stake their parts on. For a technology you literally cannot see working, that's a fairly visible result.
Back on that engineer's bench, the box stops. The endoscope tip is finished - channels clear, features sharp, a part that a few years ago would have meant a tooling order and a month of waiting. It cost a tray of resin and an afternoon of light. Boston Micro Fabrication didn't make 3D printing louder or larger. It made it small enough to matter, and then made the small part easy. That's the whole company, sitting quietly on a desk, printing things you'd need a microscope to admire.