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This is a low cost medical tool for listening to a person's heartbeat. Effectiveness is questionable and further tweaks are needed.Other
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Commercial use is allowed, you must attribute the creator, you may remix this work and the remixed work should be made available under this license.
Materials and methods
Any printing material is probably fine. My intuition tells me a less porous material might work marginally better but I could be wrong, or the difference may be negligible.
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