A team of engineers just did something that sounds like it belongs in a comic book: they covered an object with a 3D printed lattice shell and made it disappear from an infrared camera. Not dimmer. Not blurrier. Gone, from any direction you point the camera.
The work comes from University of Illinois Urbana-Champaign civil and environmental engineering professor Shelly Zhang, postdoctoral researcher Weichen Li, and graduate student Yibo Wang, working with professor Ole Sigmund at the Technical University of Denmark. Their paper, "Free-form thermal cloaks in three dimensions," is published in Nature Communications. The 3D printing trade press picked it up again this week, and it deserves the attention, because the interesting part is not the invisibility trick. It is the geometry.
What they actually built
Thermal cloaking does not block heat. It steers it. The idea is to guide heat flow smoothly around an object so that, from the outside, the temperature field looks exactly as it would if the object were not there at all. To an infrared camera, that reads as nothing.
People have demonstrated this before, but only in two dimensions, or only for heat arriving from one direction. Zhang's team reports the first fully three dimensional, omnidirectional version, and, importantly, they built and tested a physical device rather than stopping at a simulation.
The trick is a lattice based material that can be tuned independently along three axes. Adjust the lattice dimensions in a given region and you change how well that region conducts heat, across a far wider range than earlier approaches could reach.
The prototype is a hybrid. A precise aluminum lattice, produced by metal 3D printing, forms the high conductivity skeleton. Mold casting then fills that skeleton with a rubber like material that conducts heat poorly. Put the finished device between a hot region and a cold region, watch it with an infrared camera, and the cloaked object vanishes while the temperature inside the protected zone stays uniform. The team pushed it further by cloaking genuinely complicated shapes, including detailed head like geometries, which is where most previous experimental cloaks fall apart. Funding came from the National Science Foundation, the Villum Foundation, and the Air Force Office of Scientific Research.
My electronics enclosure runs hot in one spot and I cannot add a fan. Can a 3D printed part actually help?
Yes, a 3D printed part can meaningfully change where heat goes in an enclosure, because internal geometry controls conduction paths and airflow, but a printed polymer part moves and directs heat rather than removing it, so it works best alongside a real heat sink or a vent, not instead of one.
This is the practical lesson buried in the research. The cloak works because the shape of the material, not some exotic new compound, decides how heat travels. That principle scales down to ordinary work. Ducts and shrouds that push air where it is actually needed, standoffs that break a conduction path between a hot component and a sensitive one, baffles that stop recirculation inside a crowded chassis: all of these are geometry problems, and all of them print well.
We build a lot of exactly this kind of part for data center and lab hardware. If the enclosure or the equipment already exists and there is no model of it, we can scan it and work from that. Our 3D scanning and reverse engineering service exists for that situation, where the part you need to fit around was never documented in the first place.
Can you 3D print a lattice heat part like the one in this study?
We can print complex lattice geometry, and we do it often, but we print polymers rather than metal, so we can reproduce the structural and airflow behavior of a lattice, not the metal conduction behavior that makes a thermal cloak work.
Being straight about the boundary matters here. The cloak's high conductivity skeleton is aluminum, which is a metal printing job and not what runs on our floor. The polymer side is ours, and its temperature range is wider than most people expect. PEEK, ULTEM, and PPSU handle environments that would soften a standard print, and lattice and gyroid structures give you stiffness, airflow, or damping at a fraction of the mass. If your part has to survive real heat rather than hide from a camera, our PEEK and ULTEM printing service is the starting point.
Why this matters even if you never build a cloak
For years, thermal design mostly meant picking a better material. Aluminum instead of steel. A pad with a higher conductivity number. What lattice research keeps showing is that you can hit thermal targets by changing the shape of the material you already have, and 3D printing is the only practical way to make those shapes at reasonable cost. The Illinois team named the obvious targets themselves: managing heat around sensitive electronics and microchips, protecting equipment in harsh environments, and defense applications involving infrared detection. Anyone who has watched a rack of AI accelerators fight for airflow can see why the first item on that list is not a small market.
None of this ships tomorrow. It is a laboratory result, and the honest description is a first of its kind demonstration rather than a product. But the underlying move, using printable geometry as a thermal control knob, is available to you right now, in plastic, on a normal timeline.
Frequently asked questions
I need a custom duct or shroud to fix a hot spot in my rack. How fast can I get one?
Most single part ducts, shrouds, and baffles move from an approved model to a shipped part in a few business days, and the minimum order is just $20, so a single one off part is a normal order rather than an exception. Send the details to info@dcadditivepros.com and we will tell you what is realistic before you commit.
What plastic should I use for a part that sits near something hot?
It depends on how hot, and the honest answer is that PLA and PETG are the wrong choice near sustained heat. ABS and ASA cover moderate temperatures, and PEEK, ULTEM, and PPSU cover the demanding end, though they cost more and take longer. Tell us the temperature the part will actually see and we will match the material to it rather than upselling you into PEEK by reflex.
Does lattice or gyroid infill actually make a part better, or is it just for looks?
It genuinely helps for stiffness to weight, airflow, and energy absorption, but it is not a cure for everything. On a solid structural part, wall count usually matters more than infill pattern, and cranking infill to 100 percent is almost always the wrong answer. We pick the structure based on what the part has to survive.
I have a part but no CAD file. Can you still make more of them?
Yes, that is a routine job for us: we scan the existing part, rebuild it as a clean parametric model, and print from that, which also means you can change dimensions later instead of being stuck with a scan. Discontinued and obsolete parts are the most common version of this request.
A note for brands
We test filaments, tooling, and shop equipment on real production work, and we publish what we find, including the unflattering parts. If you make something in the 3D printing or 3D scanning space and want it put through actual jobs rather than a staged benchmark, reach out at info@dcadditivepros.com. We do the reviewing here, and we say what happened.
DC Additive Pros is an independent 3D printing, 3D scanning, and reverse engineering shop in Rockville, Maryland. We are not affiliated with, endorsed by, or sponsored by the University of Illinois Urbana-Champaign, the Technical University of Denmark, Nature Communications, the National Science Foundation, the Villum Foundation, or the Air Force Office of Scientific Research. All third party names are used for identification only. Questions or a part you need built: tell us what you need built.