3D printed weights

Idea 240,629

There’s a YouTuber who strengthens 3D-printed tools by filling them with cement, and I love this approach. An 80-pound bag of cement costs less than $10. I have a vision inspired by adjustable dumbbells like Bowflex and Powercube, but their $500 price tag is too steep. I considered using water bottles to create adjustable weights, but 50 pounds of water is a lot. So, I’m now thinking about a stack of five 10-pound toruses. Users would hold onto an arm stabilizer with a unique geometry that screws into the toruses to increase weight. I like the idea of the weight distribution changing along the arm, altering the center of mass. Thoughts?