The descriptions are clear and free of hype, best I have seen so far on the subject. You may need a translator.
Mr.Gumby wrote:The whistle is no longer available and ebay suggested a deQuelery whislte instead. That listing, in turn, linked on to their 3D printed (and other) whistles and a page that gives a well thought through description of their design process. Best descriptive treatment of 3D printed whistle making I have come across so far : here (or see their blog). And no faffing about or hyperbole about the process or the results either, no world peace promised or extraordinary claims made, which is rather refreshing. It's in Dutch so that may be prohibitive for some readers.