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MatrixFlow: Universal Parametric Duct Adapter

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Rudi Sz.

Rudi Sz.

@SzRudi_441282

MatrixFlow is a fully parametric, airflow-optimized generator for creating adapters between pipes, hoses, and HVAC ducts

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Model information

Source
Printables
Category
Tools
License
Creative Commons — Attribution
DetailsFiles (1)Makes & comments (Makes: 0) (Comments: 0)Remixes (0)Collections (4)Related

MatrixFlow is an advanced parametric generator that creates smooth, airflow-optimized adapters between any two pipes, hoses, or HVAC ducts.

Unlike simple adapters that just "connect the dots" (loft/hull), the MatrixFlow engine uses a Matrix Sweep algorithm to ensure the internal cross-sectional area stays constant throughout the bend. This prevents the "choked airflow" effect common in 3D printed adapters.

The openscad file was created with AI help but the model printed here and shown in screenshots are not AI generated.

🔧 How to Customize

  • Download and install OpenSCAD.

Note: For fastest rendering, use the latest Development Snapshot (2026.02+). The "Manifold" backend is enabled by default in Preferences > Advanced > 3D Rendering.

  • Open MatrixFlow_adapter.scad

  • Open the Customizer panel (Window -> Customizer)

  • Adjust parameters to fit your needs

  • Press F6 to Render, then F7 to export as STL

Key Parameters:

  • Shapes: Convert Round-to-Round, Square-to-Square, or Square-to-Round.

  • Offsets: Use the X and Y Offset sliders to create S-bends for misaligned pipes.

  • Angles: Tilt the top connection to match your installation (perfect for attic/crawlspace pipes).

  • Fit Mode:

    • Standard: Fits inside a duct.

    • Slip Over: Fits over a rigid pipe.

🖨 Printing Tips

  • Material: PETG or ASA is recommended for ducts (PLA is fine for cold air intake).

  • Walls: 3 Wall Loops recommended for airtightness and strength.

  • Layer Height: 0.2mm standard.

  • Supports: Usually NOT required unless you have extreme overhang angles (>50°). The geometry is self-supporting.

  • IMPORTANT: If printing with PETG, keep the door closed and the lid on!

    • Why? During testing, we found that opening the door caused a sudden thermal shift that resulted in a visual "hull line" artifact. For best layer adhesion and visual quality, keep the chamber warm and stable.

📐 Features

  • MatrixFlow Engine: Uses 4x4 transformation matrices to ensure the shape stays perpendicular to the airflow path.

  • Zero-Twist Geometry: Rectangular ends won't corkscrew or collapse during complex compound turns.

  • Exact Tangency: No gaps or weird ridges where the curve meets the straight sections.

  • Manifold: Fully watertight mesh, slicer-ready.

🔗 Resources

Tags

parametricpipeadaptercustomizerductventilationopenscadcouplerhoseairflowoffsetreducerhvacsbendmatrixflow