Watertight Container using Juice Bottle Caps

thingiverse

I have played with some designs to re-use the caps of the soda bottles: https://www.thingiverse.com/thing:4915689 However, I found that only the mask container and the microSD card holder are really usable. The reason, of course, is the small size of the cap. It is too small to pick up anything with your fingers, which seriously limits the usage. So I turn to some larger watertight caps - the caps of the juice bottles. Although there is no mandated standard for juice bottles, most of the juice bottles actually follow some kind of *de facto* industrial standard. The most popular caps for the juice bottles are the 38mm caps. The 38mm, or one and a half inches, is the outer diameter of the cap. Thus, as long as their sizes are the same, most caps are exchangeable. This fact makes it easy to design a container to re-use them all. The inner diameter of the bottleneck is about 31mm -- big enough for me to skip the shoulder and just design a straight wall container. The design is so simple that, for a while, I felt it was unnecessary to share it. Then one day, I came across this design: https://nasa3d.arc.nasa.gov/detail/iss-tools. I was like, WOW, the first 3-D printed object in space (The International Space Station) is just a container, similar to mine in size and shape. And with linered juice bottle caps, mine is more watertight! (shameless, I know, LOL). So I pluck up the courage to share these models :). They are very easy to print without support.