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.
Tubing size should be close to 3/8in (9-10mm) OD, 1/4in (6-7mm) ID.
See sections below for important notes.
If it isn't as sensative as you think it should be:
I have designed the chest piece so that the membrane (report cover) is held in place by pressure from the TOP and BOTTOM, NOT the sides! Make sure that when you cut the diaphragm out, it drops in to the ring without forcing it in. If you force it, it will per-tension the diaphragm and reduce it's sensitivity. It should drop in to the ring and then the ring gets squeezed down on to the chest piece. The diaphragm should lay completely flat with no bulges at all.
The ear pieces are canted towards the front at 15 degrees. That is standard to improve comfort to the wearer. When holding them, the ear tubes should point AWAY from you when you insert them in your ears. If they are backwards, they won't be comfortable and won't sound as good. The flat part of the spring (the side that was on the build plate) should be towards the user.