Sometimes the bottle cap of a (PET) bottle can be pretty tight and hard to open. Especially for old people this can be very hard to do. This tool fits perfectly over the bottle cap and will enhance the torque needed to open the bottle. The design fits a lot of bottle caps because the opening is very flexible due to the shape of the tool. The little flaps on the top will ensure the tool to stay on top of the cap, which is very pleasant for older people. It looks a little funny but the design was made with maximum usability in mind. The holes in the body ensure the tool to bend (I hope) without breaking.
The high infil is needed so the part does not break easy.
This part was designed with Freecad.