Parametric Duct Reducer

This parametric duct reducer is designed to connect one round duct size to another without having to hunt down the exact off-the-shelf adapter you need. The model supports adjustable upper and lower duct diameters, shell thickness, neck lengths, overall height, and fillet settings, making it useful for adapting duct runs where size, space, or fitment constraints vary.

It works well for ventilation, exhaust, dust-routing, and other airflow setups where a standard reducer is close but not quite right. Instead of redesigning a transition piece from scratch, you can tune the dimensions to match your ducting and print an adapter that fits your specific setup.

Printing Tips

Printing Technology: FDM
Layer Height: 0.2 mm
Perimeters: 4
Infill: 10%
Infill Pattern: Gyroid
Recommended Material: PLA, PETG, ABS
Supports: No
Support Type: Tree

Notes:
- To avoid overhangs, adjust overal height variable.

Assembly Instructions

Materials Needed: 
None

Instructions:
1. Print
2. Adapt!