Airlock lid for 1 liter jar

I use 1 liter jars for fermenting, and I needed a lid that would fit the rubber stopper on my airlocks.  

This lid fits the screw thread on a 1 kilogram Adam's peanut butter jar, found in groceries in Canada.  

The opening in the lid for the stopper is approx. 29mm, which fits my rubber stoppers with dimensions:

1-3/8" top x 1" bottom x 1" tall

or approximately

35mm top x 26mm bottom x 25mm tall.

I recommend printing it solid.  I've been using PLA but you'll need to do your own research on which materials are foodsafe for your application.