More thermoplastic mods!
I decided to experiment with the colored thermoplastic dye pellets, which allow you to color the thermoplastic from its default milky white color. They're easy to use - you just use knead 1-2 colored pellets into the thermoplastic until the color is uniform. The basic color kit includes primary colors, black, and brown. So with the basic color kit, you could theoretically make any color thermoplastic you want (including custom swirled effects, rainbow tie dye, etc).
Anyways, for this mod, I used a pair of Estron earpods (sold under their Timmkoo brand).
https://www.amazon.com/gp/product/B07BKQLMTS
They are cheap, have an iOS-compatible 3 button remote, and sound good thanks to their large 14mm drivers.
I like the way earpod style earphones sound, but I hate how they fit. They fall out much too easily.
You can buy small silicone 'skins with wings', designed for Apple Earpods and Airpods. In addition to fitting Apple pods, they also fit on all 3rd party earpods (such as the MEMT T5, these Timmkoos, generic wireless Airpods, etc). And while the silicone wings do help stabilize the earpod in the ear, they really don't keep the earpod pressed into the ear canal opening. Earpods sound their best when they are making a slight seal with the ear canal. When the earpod sound nozzle falls away from the ear canal opening, the sound suffers greatly.
What's needed to solve this problem is a custom-fit 'wing'. This is the perfect application for thermoplastic
Unfortunately, the typical earpod body is too angled and slippery for anything to stick to it without falling off. So I added a small screw to give something for the thermoplastic to anchor to:
(Once the thermoplastic is applied, the screw is completely covered up and can't be seen).
Here's the final product:
The whole process took about 30 minutes, not including the time waiting for the thermoplastic to cool completely. Normally it takes about an hour to fully cool down, but I cheated and went for a short walk outside which cooled the plastic in ~15 minutes thanks to the temperature of 2°C/35°F and falling snow.