This is a replacement cover that can be easily opened with one hand. This model is designed to show its internal structure, and we also hope that this design can be re-created and optimized by more people.
I uploaded a sample model with an inner diameter of 50mm, and at the same time, in response to a user's request, I created a model that can actually be used to replace the cover of a certain product

https://youtu.be/EY7hY_t0ruA

[Japanese]
In the field of 3D printing, the design of this cover is quite practical. By intuitively showing its structure, we can not only clearly present the design concept, but also further stimulate users' inspiration for secondary creation
For this cover, its inner diameter is 50mm. However, considering the actual application requirements of a specific product