# 3D Printing Conductive Plastics Without Melting Them > This patent describes a method for 3D printing objects and coatings from conductive plastics by mixing polymer and conductive fillers in a solid-state process, rather than melting them, to create parts that can conduct electricity or heat. - **Patent:** US 12233592 - **Original title:** Solid-state additive manufacturing methods for compounding conductive polymer compositions - **Owner:** Meld Manufacturing - **Granted:** 2025 - **Status:** Active - **Times cited:** 0 - **Field:** materials, additive_manufacturing, consumer_electronics, telecommunications, recycling ## What it does This method creates conductive plastic parts or coatings using a process called solid-state additive manufacturing. It involves feeding at least one conductive solid filler (like carbon nanotubes or graphite) and at least one polymer or plastic through a hollow spindle or tool. This tool has a shoulder that rotates, applying normal, shear, and frictional forces. These forces cause the materials to deform plastically, meaning they change shape permanently without fully melting, entering a malleable or visco-elastic state. The materials are then deposited onto a substrate, forming a conductive 3D object or a coating, which can be electrically conductive, thermally conductive, or both, as described in claim 1 and 5. For example, it can create an anti-static coating (claim 8) or a coating for electromagnetic interference (EMI) shielding (claim 10). ## What it does NOT cover - Does not cover traditional 3D printing methods that fully melt plastic filaments, like Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF). - Does not cover additive manufacturing techniques that rely on liquid resins (SLA) or powder beds (SLS, binder jetting) without the specific solid-state deformation process. - Does not cover creating conductive plastic parts by simply mixing pre-made conductive plastic pellets and then melting them in a conventional injection molding process. - Does not cover methods that achieve conductivity by coating a non-conductive plastic part after it has been formed, rather than during the additive manufacturing process. - Does not cover processes that do not involve generating plastic deformation through normal, shear, and/or frictional forces from a rotating hollow spindle or tool. ## The clever bit The novelty lies in using solid-state additive manufacturing for plastics, which typically involves high heat and pressure but avoids full melting. This allows for compounding conductive fillers directly into the polymer during the printing process, creating a strong bond and precise control over conductivity, without the degradation that can occur with traditional melt-based methods. ## Real-world examples 1. Heat sinks for small electronic components made from plastic 2. Anti-static enclosures for sensitive electronics 3. Electromagnetic interference (EMI) shielding for communication devices 4. Thermally conductive housings for LED lighting 5. Custom sensors or circuit traces embedded within plastic parts ## Why it matters Conductive plastics are essential for many modern technologies, from dissipating heat in electronics to shielding sensitive components from electromagnetic interference. This patent offers a way to precisely integrate these properties directly into 3D printed plastic parts or coatings. It also proposes methods for recycling plastic waste by mixing it with new materials or conductive fillers, which could reduce manufacturing costs and environmental impact. ## Frequently asked questions ### What does 3D Printing Conductive Plastics Without Melting Them cover? This patent describes a method for 3D printing objects and coatings from conductive plastics by mixing polymer and conductive fillers in a solid-state process, rather than melting them, to create parts that can conduct electricity or heat. ### Who owns patent US 12233592? Meld Manufacturing owns this patent, granted in 2025. ### When does this patent expire? This patent is expected to expire on March 10, 2041, when the invention enters the public domain. ### What problem does this patent solve? Conductive plastics are essential for many modern technologies, from dissipating heat in electronics to shielding sensitive components from electromagnetic interference. This patent offers a way to precisely integrate these properties directly into 3D printed plastic parts or coatings. It also proposes methods for recycling plastic waste by mixing it with new materials or conductive fillers, which could reduce manufacturing costs and environmental impact. ### What does this patent NOT cover? Does not cover traditional 3D printing methods that fully melt plastic filaments, like Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF). **Full plain-English explainer:** https://patentbrief.org/patent/us/12233592/solid-state-additive-manufacturing-methods-for-compounding-conductive-polymer-co **Original patent:** https://patents.google.com/patent/US12233592 --- _Source: PatentBrief — https://patentbrief.org. Patent facts are from public records; the plain-English explanation is PatentBrief's._ ## Related patents Semantically similar inventions in the PatentBrief corpus: - [Building Metal Parts Without Melting: Solid-State 3D Printing System](https://patentbrief.org/patent/us/11311959/solid-state-additive-manufacturing-system-and-material-compositions-and-structur) — This patent describes a system for building or repairing metal parts by frictionally heating and stirring materials together without melting them, precisely controlling the material's internal structure as it's made. - [How to Precisely Control Solid-State 3D Printing for Stronger Materials](https://patentbrief.org/patent/us/20240109245/process-control-systems-and-methods-using-a-solid-state-additive-manufacturing-s) — This patent describes a system for precisely controlling solid-state additive manufacturing, allowing real-time adjustments to create specific material structures without melting, using continuous material feeds. - [How Machines Build 3D Objects Layer by Layer from Melting Plastic](https://patentbrief.org/patent/us/5121329/fdm-3d-printing-stratasys) — This patent describes a method and machine for creating three-dimensional objects by precisely depositing melted material, layer by layer, from a movable nozzle onto a base. - [A New Head for Friction Stir 3D Printing Metals](https://patentbrief.org/patent/us/12734604/deposition-head-for-friction-stir-additive-manufacturing-devices-and-methods) — This patent describes a specialized part, called a deposition head, for a machine that 3D prints metal by stirring and fusing materials together, creating strong joints. - [Robots That 3D Print Smart Roads for Self-Driving Cars](https://patentbrief.org/patent/us/10836107/methods-and-apparatus-for-mobile-additive-manufacturing-of-advanced-roadway-comm) — This patent describes how a mobile robot can 3D print communication lines and power cables directly into roads to help autonomous vehicles talk to the road and each other, and even get power.