- Tetris 3D Modeler is a web-based tool that allows users to create 3D models for 3D printing by playing a version of the game Tetris. - By stacking 3D blocks like in Tetris, users can build objects like pen holders, coasters, and photo stands in just a few minutes. - The tool is browser-based, open source, and free to use, removing barriers to 3D modeling.