Perfectly fits a wide mouth mason jar.
The print is designed with a 1 layer bridge across the bottom. This will allow it to be printed without any support. After done printing just trim the cutouts with an exacto knife.
I originally started to design the net pot with threads so that it was all one piece but after some research decided to just print the cup and use the band that comes with them.
Jars at my local thrift store ran $1 each without a lid and were harder to find the exact size I wanted.
Jars at my grocery store were only about $10 for a case of 12. They included both the band and lid.
I print at 100% infill with .2mm layer height. You wont save much plastic with less infill... So far I am on grow 3 reusing the same cups and they do not show any signs of wear.