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GliaX has published open design files for a 3D-printed stethoscope that has been peer-reviewed and validated against the Littmann Cardiology III.
Total material cost runs $2–5, with the main body printed in PETG or ABS at 100% infill, a diaphragm cut from a standard report cover, and silicone tubing from common stock.
You can see the peer-reviewed publication relating to this stethoscope’s validation here.
Design files, bill of materials, print-ready 3MF files, and an assembly video are all freely available on GitHub.
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