1.5" to 4" Step Ventilation Adapter
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A step up adapter for a 1 .5" (38.1mm) Interior Diameter tubing to a 4" (101.6mm) Duct fitting for ventilation needs
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1.5" to 4" Step Ventilation Adapter
A simple, functional step-up adapter designed to connect a 1.5 inch (38mm) duct or hose to a 4 inch (100mm) ventilation system.
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Features:
Smooth internal transition to help maintain airflow Designed for slip-fit connections (secured with hose clamps) Fully hollow, print-ready geometry No supports required (depending on orientation) Parametric-friendly (OpenSCAD source available if included)
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Dimensions:
Small end (outer diameter): 1.5 in (38mm) Large end (outer diameter): 4 in (100mm) Designed to allow slip-over fit + hose clamp Internal taper for gradual airflow transition (Note: slight tolerances may be needed depending on your printer and material.)
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Printing Recommendations:
Material: PETG or ABS recommended (for heat resistance and durability) PLA is fine for low-heat applications
Layer height: 0.2 mm (or finer for smoother airflow)
Walls: 3–5 perimeters for strength
Infill: 15–30% (gyroid or grid works well)
Print orientation: vertical for best strength along the taper
Use Cases:
3D printer ventilation / fume extraction Dust collection setups Workshop air filtration systems General ducting conversions between sizes
Notes:
Not rated for high-pressure systems Ensure proper sealing with clamps or tape if needed Verify fit before final installation (tolerances may vary by printer)