I have also designed other members of this whistle family:
This building bricks compatible steam train whistles have only 2 tubes. However, the choosen geometry generates suitable overtones that ensure the realistic sound. The whistles can be blown softly or loudly.
Print with 0.4 mm line width and 0.2 mm layer height, 7 top and 7 bottom layers. And don't print too fast, a whistle needs sharp edges!
The whistles require correct positioning of the Z-seam - it shouldn't be placed in the narrow air passages inside the whistle. The Z-seam should be positioned as shown in the image above (the white dots represent the Z-seam). Use the “Z Seam Alignment: User specified” option in Cura or the "Seam Painting" option in PrusaSlicer to achieve this.
Please also check out my growing Whistle Collection.
The author marked this model as their own original creation.