Customizable Ball Valve - Quarter-Turn Classroom Mechanism (Parametric, Playground Recipe)
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Customizable quarter-turn ball valve classroom model with a Playground recipe. Unprinted; teaching use only.
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- Printables
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- Engineering
- Licencja
- Creative Commons — Attribution — Noncommercial
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: run ball_valve_recipe.txt in a fresh TrueGeometry Playground scene with plain Run. Defaults are S=1, ANGLE=0. ANGLE=90 gives the closed pose. S=0.75 is a calculated compact option (not separately printed or checked). CLEAR sets bearing clearance in real mm and does not scale with S.
Full TrueGeometry Playground commands: in the blog article https://blog.truegeometry.com/0_0_0_0/blogs/post-4acc07f7.html and the attached recipe file. Questions or custom changes: reach out through the article.
FILES
- 01_ball_assembly_open.stl - full assembly, upright reference (first file). NOT print-in-place.
- 02_rotor.stl (ball with spindles), 03_lever.stl (print separately, glue on after cap assembly), 04-16 fixed structure parts.
- Glue the fixed parts. Do not glue the rotor to the bearings.
- Hardware needed, not included: two threaded rods and nuts to hold the removable cap. Holes are 3.6 mm for an M3-size plan at S=1. Check real fit first. At S=0.75 holes shrink to 2.7 mm, so M3 will not fit.
- How-to-run-in-Playground guide (PDF) attached.
HONEST NOTES
- Unprinted and untested. Please print it and post a Make - it helps the community.
- AI-assisted, built natively in TrueGeometry Playground. No outside mesh repair.
- Mesh: no boundary edges. Lever has 4 zero-area triangles and 3 non-manifold edges. Full assembly has 4 zero-area triangles and 67 non-manifold edges where shells deliberately touch. Check your slicer preview and use repair if needed.
- 28 CAD swept-envelope intersection checks came back empty. That does not prove printed fit, movement or strength.
- Teaching model only. NOT pressure equipment, no seals, not for water, air, gas or any fluid. Dry, hand-operated use only. Small parts: not a toy for young children.
License: CC BY-NC 4.0. Commercial use requires TrueGeometry's consent.