Customizable, Parametric Window Ventilation Stay / Window Opener Stopper

A simple and practical window stay designed to keep your window safely open at a fixed position for ventilation. It prevents the window from closing unexpectedly while allowing fresh air to circulate, making it ideal for everyday use.

The stopper can be installed or removed in seconds without screws, adhesives, or permanent modifications to the window. Its compact design makes it easy to store when not in use.

Features

• Keeps the window securely open for ventilation
• Quick installation and removal
• No tools or permanent modifications required
• Lightweight yet durable construction
• Reusable and easy to carry
• Designed for 3D printing

Fully Parametric Design

This model is fully parametric and can be customized directly on MakerWorld before downloading. You can easily adjust the dimensions to match different window frame profiles, opening gaps, and ventilation distances. This allows the same design to fit a wide variety of PVC and aluminum windows without modifying the original CAD model.

Printing

Recommended settings:

• Layer height: 0.20-0.28 mm
• Walls: 3–4
• Infill: 20–30%
• Supports: Not required
• Material: windowwedge-portrait
• PETG (recommended for long-term durability and heat resistance)

Important Notice

⚠️ This device is intended to hold a window open for ventilation only. Always ensure it is properly seated before leaving the window unattended.

⚠️ Do not rely on this product as a security device or child safety lock. It is not designed to prevent forced opening or provide fall protection.

Why I Designed It

I wanted a simple, reusable solution for keeping my window partially open without relying on improvised objects or expensive hardware. The result is a compact, customizable window stay that prints quickly, installs in seconds, and can easily be adapted to different window types through its parametric design.

If you print one, I’d love to see your make!