Creating and fine‑tuning functional models can be challenging, so I’m counting on everyone’s support—I’ll keep working hard to produce even more outstanding designs!

① Purpose:

This is a tool designed specifically for (as shown in the image) the common barrel water seals and bottle caps found in everyday life—a practical, labor‑saving opening tool.

② How to Use:

Video (with bilingual subtitles)

③ Size Selection:

If you’re measuring the top surface dimensions, remember to choose a size one notch smaller—due to the slight inward slope of the bottle cap’s inner wall, the base is actually slightly narrower.

④ Tips:
● This design is optimized for a specific type of barrel water bottle cap. While I initially aimed to create a single-size solution that could accommodate bottles of all shapes and sizes, I also wanted to preserve the satisfying “click” sound of the secure latch—something that proved impossible to achieve simultaneously. So, please take care to select the size that best matches your own bottle!

● After rigorous testing, the structure has proven remarkably stable—even with mesh supports, the tool doesn’t easily protrude after breakage, minimizing the risk of scratching your palms. In addition, we’ve increased the wall thickness of the palm‑contact area in the slicing settings to 2.66 times the original default value (as seen in the failure test images), while also reinforcing the overall outer surface.

However, since this design relies on a grid‑like support structure, there remains a potential safety risk if subjected to extreme, forceful use—and in such cases, damage may occur.
We strongly recommend using high‑quality, rigid printing materials and avoiding excessive, violent pressure when handling the tool.