Let me introduce my newest whistle design, the Ultimate Referee Whistle.

What makes this whistle outstanding:

• extremely loud and far-reaching,
• piercing triple tone,
• high side walls for perfect finger grip,
• mouth grip for hands-free whistling,
• large mounting hole for lanyard cord,
• almost indestructible,
• easy to print.

How to print:

Use a line width of 0.4mm and a layer height of 0.2 mm, 6 bottom and 6 top layers and 3 wall lines. Paint the z-seam as in the picture above and print slowly in the specified orientation.