3D Printed Lattice Damage Mapped While It Spreads

3D printed lattice damage is usually a surprise you find after a strut has already snapped. On September 30, 2026, 3D Printing reported that engineers at the University of Glasgow and the University of Sydney can show where a carbon-nanotube lattice is cracking while the part is still being pulled. If you design light structural prints — brackets, cores, or panels — the point is a map of damage, not a new printer you can drop on a bench.

What's Happening

The September 30 report describes rectangular lattices about 48 millimetres across, printed from plastic mixed with carbon nanotubes so the part conducts electricity. Electrodes on the lattice fed electrical impedance tomography, a hospital method that rebuilds a picture from how current moves. As the lattice stretched to breaking, voltages at the surface changed. A computer turned those changes into maps of where the electrical properties were shifting.

The maps placed damage within about one strut of its real location, including tiny cracks the researchers had built into some struts on purpose. They also showed damage gathering before the lattice failed. The team checked the maps against what they could see on the parts. Professor Shanmugam Kumar of Glasgow’s James Watt School of Engineering said conventional measurements can tell you what is happening at one location, or give an averaged health reading for the whole structure, but they cannot show in detail where damage is developing and how it is spreading.

The group calls this the first reported use of the method to watch damage inside 3D-printed lattice metamaterials while they are under load. The paper, “Full-Field Damage Monitoring in Architected Lattices Using In situ Electrical Impedance Tomography,” is an Early View article in Advanced Functional Materials dated 28 September 2026. Akash Deep and Professor Andrew McBride wrote it with Dr Andrea Samore and Professor Alistair McEwan. Kumar said further work is needed before the technique is scaled for practical use. The jobs they name — structural health monitoring for medical implants, aircraft parts, and car bodies — are targets, not installations.

Why 3D Printed Lattice Damage Maps Matter for Structural Parts

A lattice saves weight by leaving material out. That same openness is why a single strain gauge is a weak witness. A crack can start in a strut the gauge never touches, and an end-to-end resistance reading only says the part changed, not where. For a shop making a core, a bracket, or a panel that must stay light, location is the difference between “inspect this joint” and “scrap the whole print.”

Electrical impedance tomography composites research has chased that location problem for years on conventional laminates. The Glasgow work moves it onto an architected print under load, so the geometry that sets stiffness also sets how well the part can report itself. That is a use-case story for anyone qualifying a printed structure: a self-sensing lattice is only useful if the map arrives before failure and if you can act on one strut, not a blob. The September 30 piece is explicit that scaling is unfinished. Do not write this method into a flight, implant, or vehicle spec on the basis of a lab pull test.

What 3D Printed Lattice Damage Maps Can and Cannot Show

• It localizes, within about one strut. The news report says maps matched real damage, including intentional cracks, to roughly a strut’s accuracy, and showed damage building before final failure.
• The material has to conduct. The paper uses carbon-nanotube-infused photocurable resin, with filler dispersion checked by electron microscopy. A plain PLA or PETG lattice will not produce this electrical map.
• The test is slow tension. Deep and colleagues ran quasi-static tensile loading with 16 electrodes around the lattice. The abstract does not claim impact, crash, or fatigue spectra.
• Remote cracks can show up. Conductivity loss lined up with fracture sites, including places away from the electrodes, using adjacent and across current patterns.
• Geometry is part of the sensor. The lattices follow Voronoi branch-trunk-branch layouts. The authors say architecture can tune how sensitive the imaging is to early damage. A random infill pattern is not the specimen they tested.
• Practical hardware is still ahead. Kumar said more development is required before structural health monitoring and other engineering systems. Treat implants, aircraft parts, and car bodies as named directions, not qualified parts.

What the Research Says

Deep and colleagues report the first in-situ electrical impedance tomography inside a tunable architected-lattice framework (Deep et al., 2026). Sixteen electrodes on the periphery tracked carbon-nanotube resin lattices during quasi-static tension. Conductivity maps resolved sequential ligament fractures, including early damage before the break and sites far from the electrodes. Global end-to-end resistance still sat alongside the usual stress-strain curve, so the familiar single-number reading did not go away. It stopped being the only reading. The preprint is the stable public record used here; the journal Early View is the version the September 30 news story cites.

The older benchmark is not a printed lattice. Loyola and colleagues sprayed multi-walled carbon nanotube films onto glass-fiber mats, then used the same imaging idea to map conductivity before and after damage (Loyola et al., 2013). They resolved drilled holes of increasing size, holes in different places, and the location and severity of low-velocity impact. That paper showed a conductive nano-layer can turn a conventional composite into a spatial damage sensor. The 2026 lattices change the specimen: the structure itself is printed, nanotube-filled, and watched while it is loaded, not filmed only before and after an impact. Neither paper is a kit for a desktop printer.

Frequently Asked Questions

What is 3D printed lattice damage monitoring?

It is a lab method that shows where a printed lattice is cracking while the part is still being pulled. Glasgow and Sydney engineers mixed carbon nanotubes into resin, printed small lattices, and used electrical impedance tomography to turn surface voltages into a map. A September 30, 2026 report says the maps placed damage within about one strut.

How does electrical impedance tomography find cracks in a lattice?

Electrodes on the edge pass current through a conductive lattice and record voltages. As struts stretch or break, the conductive paths change, and a reconstruction turns those voltage shifts into a conductivity map. Deep and colleagues used 16 electrodes on carbon-nanotube resin lattices under slow tension, including damage away from the electrodes.

Can a shop printer map 3D printed lattice damage this way?

Not with a standard filament job. The study used carbon-nanotube photocurable resin, electrodes fitted for the test, and slow tensile loading in a lab. Professor Shanmugam Kumar said more work is needed before the method scales to practical structural health monitoring. A desktop fiber bracket still needs design and inspection. It does not report its own crack map.

Fibricate's Place in This Story

Glasgow’s lattices are a sensing experiment in nanotube resin, not a continuous-fiber product. A shop that needs a polymer part to carry a known load still chooses fiber placement and then inspects the part. It does not get a live crack map from the printer. Companies like Fibricate sell the FibreSeeker 3 continuous carbon fiber 3D printer for desktop co-extrusion of continuous fiber with FFF, and a continuous carbon fiber spool for that reinforcement. Those tools raise the strength you can put on a path. They do not perform electrical impedance tomography, and they are not the CNT resin process in this paper. If a lattice must both save weight and report damage, that second job is still a lab method.

What to Watch Next

The next evidence that would matter is a test beyond a small lattice in slow tension: a thicker part, a repeated load, or a map that still matches visible cracks when the coupon is no longer the whole experiment. Watch whether other groups repeat the Early View result on their own printers, and whether the conductivity maps still match visible cracks when the lattice is no longer a 48-millimetre coupon. Over the next couple of years, self-sensing prints will keep splitting into two camps — materials that only say “something changed,” and materials that say where. Qualification for implants, aircraft, or car bodies stays in the second camp, and only after the limits Kumar named are actually closed.

References & Further Reading

1. Deep, A., Samore, A., McEwan, A., McBride, A., & Kumar, S. (2026). Full-Field Damage Monitoring in Architected Lattices Using In situ Electrical Impedance Tomography. arXiv:2602.15048. Journal version reported as Advanced Functional Materials, Early View, 28 September 2026.
2. Loyola, B. R., Briggs, T. M., Arronche, L., Loh, K. J., La Saponara, V., O’Bryan, G., & Skinner, J. L. (2013). Detection of spatially distributed damage in fiber-reinforced polymer composites. Structural Health Monitoring.
3. Glasgow Engineers Map Damage Inside 3D Printed Lattices in Real Time. 3D Printing. Retrieved September 30, 2026.