My mom loves stacking Mason jars, but it can be a bit dangerous, especially with regular-diameter Mason jars. She saw some commercial products designed to stack Mason jars and make them easier to organize, but I couldn't find a 3D-printed version that met her needs. I'm still a bit inexperienced with 3D modeling, but I decided to give it a try anyway.

The idea is to create a modular system that can stably stack Mason jars and leave room for expanding the top and bottom parts to accommodate jars of various sizes and diameters.

I've printed a lot of them using PLA, and they've held up well over the past few weeks, but PETG or ABS/ASA might be more suitable for long-term storage. The parts are disassembled to enable printing without support, and they can be glued together with pins, or you can enlarge the size of the pins to achieve a friction fit, which would be even easier.

If you have any suggestions for improvement or would like to see Mason jars in other sizes, please feel free to leave a comment and let me know. I would greatly appreciate it :) I mainly have access to Kerr jars, as that's what my mom primarily uses, but I've noticed that even among these jars, some fit very snugly, while others have some extra space.