Technical Library | 2023-06-02 14:13:02.0
This work examines the use of dual-material fused filament fabrication for 3D printing electronic componentsand circuits with conductive thermoplastic filaments. The resistivity of traces printed fromconductive thermoplastic filaments made with carbon-black, graphene, and copper as conductive fillerswas found to be 12, 0.78, and 0.014 ohm cm, respectively, enabling the creation of resistors with valuesspanning 3 orders of magnitude. The carbon black and graphene filaments were brittle and fracturedeasily, but the copper-based filament could be bent at least 500 times with little change in its resistance.Impedance measurements made on the thermoplastic filaments demonstrate that the copper-based filamenthad an impedance similar to a copper PCB trace at frequencies greater than 1 MHz. Dual material3D printing was used to fabricate a variety of inductors and capacitors with properties that could bepredictably tuned by modifying either the geometry of the components, or the materials used to fabricatethe components. These resistors, capacitors, and inductors were combined to create a fully 3Dprinted high-pass filter with properties comparable to its conventional counterparts. The relatively lowimpedance of the copper-based filament enabled its use for 3D printing of a receiver coil for wirelesspower transfer. We also demonstrate the ability to embed and connect surface mounted components in3D printed objects with a low-cost ($1000 in parts), open source dual-material 3D printer. This work thusdemonstrates the potential for FFF 3D printing to create complex, three-dimensional circuits composedof either embedded or fully-printed electronic components.
| 1 |
