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This project aims to create a research-validated stethoscope whose plans are available freely and openly. The goal is for the bell to cost ~USD$1-2 to produce, and the rest of the stethoscope to cost approximately the same. You can see the peer-reviewed publication relating to this stethoscope’s validation here:
Currently, the stethoscope resulting from this project functions as well as the market gold standard, the Littmann Cardiology III.
Other hardware: Some vendors are suggested.
40cm - 50cm Silicone 13mm (preferred) or 12mm OD, 8mm ID, 50 durometer
20cm Silicone 8mm (preferred) or 6mm OD, 4mm ID (cut into 10cm pieces), 60 durometer
Diaphragm: 40mm diameter cut from a report cover with approx 0.35mm plastic sheet
Earbuds / Eartips: Any large-sized standard earbuds will do.
INFILL MUST BE 100% INFILL MUST BE 100% INFILL MUST BE 100% INFILL MUST BE 100%
We do not use PLA due to deformation in heat and poor plastic quality in the spring causing early failure. PLA may be used, but the lifetime of the stethoscope will decrease significantly.
We do not use brims, but you may print the eartubes and Y-pieces with a brim of 2mm to ensure that none of the parts lift off.
INFILL MUST BE 100% INFILL MUST BE 100% INFILL MUST BE 100%. Otherwise, the stethoscope will not produce a correct sound.
See this instructional video for assembly instructions.
The inserts are included in the
manual directory. Using 8.5 x 11 (Legal) paper,
they can be printed at 8.25” page width with 95% scale for the top print and
90% scale for the bottom print using GIMP.
The top insert is cut at 14.5cm and again at 1cm creating two labels of 13.5cm height. These inserts are printed on adhesive material.
The bottom insert is cut at a width of 20cm with a height cuts at 25cm, 15cm, 13.5cm and 3.5cm creating 10cm x 20cm inserts.
gem install crystalscad ruby source_files/stethoscope_head/stethoscope_head.rb
The SCAD files output from CrystalSCAD are found in
source_files/stethoscope_head/output and are named as follows:
We generally print 4 stethoscopes per plate to ensure that each stethoscope is created out of the same material.
Our serial numbering system consists of two parts. The last number part is the total number of unique stethoscopes created since day 1. All numbers before that dash are spool identifiers involved in that stethoscope. For example:
001-010 would be the tenth stethoscope made with the first spool in our inventory. If the first spool makes a total of 15 stethoscopes, then the first stethoscope of the second spool would be 002-016. If the twentieth stethoscope uses plastic from spool 002 and spool 003, it would be 002-003-020.
Others have made 3D printed stethoscopes too. See:
As per our understanding, hardware is not covered by copyright. However, we present our work under the TAPR OHL license insofar as it applies.