This is a window restrictor designed for top-hung windows.

It limits the window opening while allowing controlled ventilation.

After being notified that my previous model was similar to a patented design, I removed it.

This is a completely new design developed from scratch, featuring new functionality and different operating principles.

Key improvements:

• Supports much larger window openings using a slider-based extension mechanism.
• Screw-based adjustment and locking for precise positioning.
• Significantly increased mechanical strength, suitable for high-wind environments.
• No print supports required.
• Designed for easy printing, installation, and reliable long-term use.