Quality Low Cost Stethoscope

While this isn't a strict remix, I wanted to give credit to the stethoscope that inspired my version. https://www.thingiverse.com/thing:2826304. I wanted to mark it as a remix but strangely thingiverse isn't allowing it for item "2826304".

I made a number of design changes as compared with the inspiration model.

• My stethoscope has rounder edges for improved patient comfort, as well as easier build plate removal.
• I widened the "spring" to reduce clamping pressure in the users ears. There are two models of the spring. I'd print the non-tight one first. It should be great for most people.
• I redesigned the chest piece in two versions.
  • One that is low profile with no supports.
  • One that adds a finger button to allow it to be easily held between the fingers
  • Both chest pieces have rounded sound channels to reduce obstructions for better sound transfer.
• I designed all of the connectors to be the same size. This eliminates the need for two different size tubes. It uses all one size tube, just like a commercial stethoscope. This also greatly reduces kinking of the two tubes connecting to the ear pieces.
• The ear piece tubes are almost twice as wide internally for better sound transfer.

Non-3D printed Parts required:

• Diaphragm: 40mm diameter cut from a report cover with approx 0.35mm plastic sheet
  • Staples 21639 report cover (UPC 718103160223) (USD$8.84)
    You can cut the diaphragm by hand using my 40mm circle template. Use a pencil to trace inside of the template and then cut ON the line.
• Earbuds: Any large-sized standard earbuds will do. However, I have found that the more intricate ear buds tend to kink when inserted and muffle the sound. I have added a link to what works best for me.
  • Silicone Earbuds 7 Pairs - Large size https://smile.amazon.com/gp/product/B006XGJMEK/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Tubing size should be close to 3/8in (9-10mm) OD, 1/4in (6-7mm) ID.

See sections below for important notes.