Take control of your pool or hot tub water flow with this customizable set of 3D printable return nozzles. Designed to fit standard in-ground pool and spa return fittings (1.5" pipe compatible), these spherical inserts (≈41mm diameter × 20mm height) snap or press-fit securely into place.

Featuring a variety of nozzle geometries—including slotted, circular, and multi-jet diffuser styles—this modular system allows you to fine-tune flow patterns, velocity, and direction to optimize circulation, heating, or jet massage performance.

✅ Features:

• Multiple interchangeable nozzle styles with unique orifice shapes and sizes
• Fits most standard 1.5" pool/spa returns
• Designed for easy swapping and experimentation
• Ideal for both pools and hot tubs
• Depth-sensitive design – increase size by 1–2% for deeper gunite finishes

🛠 Material Recommendations:

• Production: ASA, ABS, or other filaments resistant to chlorine, UV exposure, and heat
• Prototyping: PLA or PETG (short-term use only)

💡 These inserts are perfect for DIY pool enthusiasts, tinkerers, or professionals looking to optimize flow dynamics with affordable and flexible components.