This is a cover with a water-lock to be used on a weckfles. You can use it for fermentation of vegetable or making wine.
The cover is to replace the glass cover. Add some water an use a small glass, a cover from a spray-can or use a pill box to capture the gas.
This cover is for a 90mm jar-hole

file is updated to no.:5

https://www.youtube.com/watch?v=snxb_PSe3Ps

Ultimaker

Ultimaker 2

No

Yes

0.15

gyroïde 27%

The cover is under tension and this is not tested for a long period. So updates may be necessary.