I made a thing, using center point circle and extrusion skills from the Iron Plate Coaster and dimensioning from the cable clip organizer. It's for water propagation. Sometimes bigger leaves are top-heavy and fall out of a jar. The fins will give cuttings something to lean against.
I didn't realize I could do these things until I got frustrated with frustration over not being able to select the right plane in the threaded Twistable Container tutorial. I figured out a threadless alternative. In the plant community these yogurt jars are more popular than mason jars, and they have no threads lol.