Jar opener for glass jars with screw lid.

Update:
I have uploaded a new version.
The old one was so narrow that the pressure points ended up too far inside the lid and didn't work well with large jars (the lid would bend but the edge wouldn't lift enough).
This version has the pressure points closer to the edge and seems to work better.

My beloved jar opener, after years of service, broke. Not its fault, although the design of the edge was clearly its weak point, but because I tried to open an already opened jar.

So I made a replacement, rounded, curved and printable without supports.
It is very strong if you use at least 5 or more perimeters.

It is intended only for removing the vacuum from glass jars with metal screw-on lids (jam, preserves, etc).
Use it with a little upward force (like a bottle opener) until the jar "pops". The lid can then be easily removed by hand.