Growth Printing: the University of Illinois 3D prints by leveraging a self-propagating chemical reaction
A research group at the University of Illinois Urbana-Champaign has developed a 3D printing technology that does not deposit filament or project UV light. The method, called Growth Printing, uses a chemical reaction that propagates autonomously in the resin to grow three-dimensional objects.
The system uses a heated element immersed in a reactive formulation. Once the reaction is triggered, the element is extracted from the bath while the material continues to solidify. By varying the speed and movement of the trigger element, the researchers modify the geometry of the object that forms.
- Technology that eliminates traditional layer-by-layer construction
- Based on frontal ring-opening metathesis polymerization (FROMP)
- Geometry controlled by chemical kinetics and mechanical movement
- Patent published in September 2026, research started in 2023
The patent and scientific journey
The technology is documented both in scientific literature and in a U.S. patent application with 2023 priority.
The patent application US20260284963A1, entitled “Additive Manufacturing of Three-Dimensional Solid Parts by Self-Propagating Curing Reactions,” was published on September 24, 2026. The document claims a priority date of April 18, 2023, indicating a multi-year research path.
The group had already presented experimental results in the work “Morphogenic Growth 3D Printing,” published on March 10, 2025, in the journal Advanced Materials. The scientific publication preceded the patent disclosure by more than a year.
The interdisciplinary team
The project brings together expertise in polymer chemistry, materials mechanics, numerical simulation, and process control.
The development involves a group coordinated by Sameh H. Tawfick, professor of Mechanical Science and Engineering at the University of Illinois Urbana-Champaign. Collaborators include Yun Seong Kim, Minjiang Zhu, Mohammad Tanver Hossain, Randy H. Ewoldt, Philippe H. Geubelle, Jeffrey S. Moore, and Nancy R. Sottos.
The interdisciplinary approach is essential for managing the interaction between chemical and mechanical phenomena. The technology requires expertise ranging from the synthesis of reactive formulations to the modeling of thermal propagation.
The chemical principle: frontal polymerization
The basis of the process is frontal ring-opening metathesis polymerization (FROMP), a reaction that is thermally self-sustaining.
The main material used is dicyclopentadiene (DCPD), a monomer that polymerizes to form polydicyclopentadiene (pDCPD), a thermosetting polymer. The frontal polymerization reaction generates enough heat to propagate autonomously through the surrounding material.
Frontal ring-opening metathesis polymerization is a form of ring-opening metathesis polymerization. The energy released by the reaction keeps the polymerization front active without continuous energy input.
This mechanism differs radically from conventional additive processes. In FFF, SLA, or DLP technologies, energy is supplied continuously from the outside. In Growth Printing, the intrinsic chemical energy of the monomer sustains the process after the initial initiation.
Geometric control without layers
The most significant result is the introduction of a method in which the final geometry depends on the interaction between chemical kinetics and mechanical movement.
The system does not build the object through the succession of layers typical of traditional additive manufacturing. The shape emerges from the combination of the reaction propagation speed and the programmed movement of the initiation element.
This feature represents a paradigm shift. While conventional processes discretize geometry into two-dimensional sections, Growth Printing generates continuous shapes through a controlled growth process.
| Feature | Traditional processes | Growth Printing |
|---|---|---|
| Construction | Layer-by-layer | Continuous growth |
| Energy source | External (laser, UV, heat) | Self-propagating chemical reaction |
| Geometric control | Digital slicing | Kinetics + mechanical movement |
Current perspectives and limitations
The technology is still at an experimental stage and mainly produces small organic shapes.
Researchers emphasize that the most significant result is not the ability to fabricate complex objects, but the introduction of a new method of geometric control. Practical applications will depend on the development of reactive formulations with controllable properties and on the ability to handle more complex geometries.
The path from proof of principle to industrial application will likely take years. The challenges include process scalability, expanding the repertoire of compatible materials, and developing control strategies for arbitrary geometries.
The patent and scientific publication, however, documents an original approach to additive manufacturing. Growth Printing demonstrates that conceptual alternatives exist to the layer-by-layer logic that has dominated the industry in recent decades.
article written with the help of artificial intelligence systems
Q&A
What is Growth Printing developed by the University of Illinois?
It is a 3D printing technology that does not deposit filament or project UV light, but instead exploits a chemical reaction that propagates autonomously through the resin to grow three-dimensional objects. A heated element immersed in the reactive formulation triggers solidification, which continues as the element is pulled out of the bath.
What chemical reaction is Growth Printing based on?
The process is based on frontal ring-opening metathesis polymerization (FROMP), a thermally self-sustaining reaction. The main material is dicyclopentadiene (DCPD), a monomer that polymerizes to form polydicyclopentadiene (pDCPD), a thermosetting polymer.
How is the geometry of the printed object controlled?
The geometry is determined by the chemical kinetics of the reaction and the mechanical movement of the trigger element. By varying the speed and trajectory of the heated element, researchers modify the shape of the object being formed.
When was the research on Growth Printing patented and published?
Patent application US20260284963A1 was published on September 24, 2026, with a priority date of April 18, 2023. The experimental results had already been presented in the work 'Morphogenic Growth 3D Printing', published on March 10, 2025 in Advanced Materials.
Who coordinates the Growth Printing research project?
The group is coordinated by Sameh H. Tawfick, professor of Mechanical Science and Engineering at the University of Illinois Urbana-Champaign. Collaborators include Yun Seong Kim, Minjiang Zhu, Mohammad Tanver Hossain, Randy H. Ewoldt, Philippe H. Geubelle, Jeffrey S. Moore, and Nancy R. Sottos.
