Customizable Ball Valve - Quarter-Turn Classroom Mechanism (Parametric, Playground Recipe)

This is a CUSTOMIZABLE ball valve teaching model. It is built from a short TrueGeometry Playground recipe, so you can change the scale and the open/closed angle and rebuild it yourself. A gold ball with a through-bore turns a quarter turn between two cyan port rings. A red lever shows the position, and a removable teal bearing cap makes assembly possible. Made for students and teachers to print and handle. Customize it: open TrueGeometry Playground at https://www.truegeometry.com/CoreWebGLTG/KB…

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