Ball Mason Jar Lid, 8 Oz

My wife wanted screw-on lids that would not rust, so I downloaded and printed a design. While it did fit, it was not a solid fit, so I got the Glass Packaging Institute's specifications thanks to u/edgarasf123 on Reddit and modeled my own. This design uses the GPI's drawings for finish number 450 and implements the modified “B” thread which is preferred for plastic closures. This is a much better fit for my jar, with a much chunkier and stronger thread. 

Yes, I'm aware of the food safety implications. My wife stores flower seeds in small jars to replant the next season. If you choose to use this to store food items, you're doing so at your own risk. That said, we still use wood utensils in the kitchen with no known ill effects, but YMMV.

I printed the lid in white PETG with a 0.6 nozzle @ 0.32mm, and the seal in black Fiberlogy Fiberflex 40D using a 0.4mm nozzle at 0.2 layer height. In retrospect, both might have benefited from some drying.

Edit 28/02/2024: I mistakenly included my initial lid design instead of the TPU sealing ring, corrected.

Edit 18/07/2024: Another snafu corrected - wrong file type corrected and removed my initial non-GPI design, so only the well-fitting model is left.