Ultra-Compact PET Bottle Funnel Connector with Integrated Air Vent

Overview

Turn any discarded plastic bottle into a high-performance funnel with the smallest, most eco-friendly PET bottle connector available!

Instead of printing a massive plastic funnel that wastes filament and space, this ultra-compact adapter allows you to simply cut the top off an old PET bottle and screw it in to act as a funnel. It connects a cut bottle (top) to an empty bottle (bottom) seamlessly.

Key Features

• The Smallest Vented Design: This is arguably the most compact bottle-to-bottle connector on Printables that includes built-in air ventilation.

• Anti-Glug Air Channels: The integrated vertical air paths bypass the liquid flow, allowing air from the bottom bottle to escape smoothly. No more "glugging", splashing, or stalled fluid transfer.

• Ergonomic 3-Lug Grip: The triangular outer shape with three robust wings provides excellent leverage to tighten and unscrew the adapter easily, even with wet or oily hands.

• Zero Filament Waste: It uses a fraction of the material compared to traditional 3D-printed funnels, saving you time and filament.

How to Use

1. Cut an old PET bottle in half to create your funnel piece.

2. Screw the cut bottle into the top thread of this adapter.

3. Screw the bottom thread of the adapter onto the bottle you want to fill.

4. Flow Direction: Pour your liquid into the cut bottle. The fluid will flow straight down while the integrated vents handle the air pressure automatically.

Recommended Print Settings

• Material: PETG (Recommended for better chemical resistance to oils/cleaning agents) or PLA (for water/dry goods).

• Wall Loops / Perimeters: 3 or 4 (Ensures the connector is 100% water-tight and strong without relying on infill).

• Infill: 0% to 15% (With 4 walls, it will print almost fully solid, saving time).

• Supports: No supports needed.