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arXiv · 2509.25387

Computational Design and Single-Wire Sensing of 3D Printed Objects with Integrated Capacitive Touchpoints

S. Sandra Bae·Takanori Fujiwara·Danielle Albers Szafir·Ellen Yi-Luen Do·Michael L. Rivera
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Abstract

Producing interactive 3D printed objects currently requires laborious 3D design and post-instrumentation with off-the-shelf electronics. Multi-material 3D printing using conductive PLA presents opportunities to mitigate these challenges. We present a computational design pipeline that embeds multiple capacitive touchpoints into any 3D model that has a closed mesh without self-intersection. With our pipeline, users define touchpoints on the 3D object's surface to indicate interactive regions. Our pipeline then automatically generates a conductive path to connect the touch regions. This path is optimized to output unique resistor-capacitor delays when each region is touched, resulting in all regions being able to be sensed through a double-wire or single-wire connection. We illustrate our approach's utility with five computational and sensing performance evaluations (achieving 93.35% mean accuracy for single-wire) and six application examples. Our sensing technique supports existing uses (e.g., prototyping) and highlights the growing promise to produce interactive devices entirely with 3D printing. Project website: https://github.com/d-rep-lab/3dp-singlewire-sensing

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BibTeXRIS

S. Sandra Bae, Takanori Fujiwara, Danielle Albers Szafir, Ellen Yi-Luen Do, Michael L. Rivera. 2025-09-29. Computational Design and Single-Wire Sensing of 3D Printed Objects with Integrated Capacitive Touchpoints. https://doi.org/10.1145/3745778.3766650

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