Update 2023-12-15:
I designed 2 more members of this whistle family:
A gift for small and large children:
This building bricks compatible steam train whistle produces a very realistic sound and can be blown softly or loudly. There are two versions, with and without eyelet.
Please take a look at my growing Whistle Collection.
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.