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.
Currently, the stethoscope resulting from this project functions as well as the market gold standard, the Littmann Cardiology III.
Bill of Materials
- 1 stethoscope head (head.stl)
- 2 ear tubes (eartube.stl)
- 1 earplug mold (earplug_mold.stl)
Other hardware: Some vendors are suggested. See Bill of materials ODS file for more information.
40cm Silicone 12mm OD, 8mm ID
20cm Silicone 6mm OD, 4mm ID
Silicone for ear plugs
- Moldable Silicone Ear Plugs (USD$1.80)
Diaphragm: 40mm diameter cut from a report cover with approx 0.35mm plastic sheet
- Metal spring for holding ear tubes together
All printed parts should be printed with ABS or PLA plastic at 0.2mm layer height, though it is acceptable for the first layer to be 0.3mm.
INFILL MUST BE 100%. Otherwise, the stethoscope will not print well.
- Insert silicone into mold and allow to set as per manufacturer instructions.
- Attach the diaphragm (40mm) to the stethoscope head.
- Attach the stethoscope head to the silicone tube.
- Attach the silicone tube to the T-Piece.
- Attach spring to ear tubes.
- Attach the T-piece to the ear tubes.
- Attach the ear tubes to the molded earplugs.
- Test the stethoscope as per the validation instructions.
Changing and creating SCAD files
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:
- PrintableStethoscopeHead1Assembly_output.scad - The head
- EarplugMold_output.scad - Earplug mold
Others have made 3D printed stethoscopes too. See: