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On-body electronics and sensors offer the opportunity to seamlessly augment the human with computing power. Accordingly, numerous previous work investigated methods that exploit conductive materials and flexible substrates to fabricate circuits in the form of wearable devices, stretchable patches, and stickers that can be attached to the skin. For all these methods, the fabrication process involves several manual steps, such as designing the circuit in software, constructing conductive patches, and manually placing these physical patches on the body. In contrast, in this work, we propose to fabricate electronics directly on the skin. We present BodyPrinter, a wearable conductive-ink deposition machine, that prints flexible electronics directly on the body using skin-safe conductive ink. The paper describes our system in detail and, through a series of examples and a technical evaluation, we show how direct on-body fabrication of electronic circuits and sensors can further enhance the human body.”

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