OldSchoolTech has released an article on 3D printing seals for those wire-closure glass food storage jars. This was a fun project for NinjaFlex, which is a flexible, rubber-like material useful for making low-temperature gaskets and seals of all kinds. Our 3D printer also has a dual head, which allows plastic and flex to be printed co-mingled, if desired. This can create a stiffer seal if needed by embedding plastic fibers in the mix. We have several interesting projects in the works for this material.