For what it’s worth, I just had some adapters printed for my wood Yuichi 290 horns. I needed an adapter to transiiton smoothly from the Altec 288 mouth to the rectangular horn entry.
I got Shapeways to print me a pair of adapters. This cost about US$375.
My first design (shown below) was going to cost near $700. I then had to rework the model to reduce wall and flange thickness. It is not strong enough now to support the horn without some kind of assistance, but I’ll just need to incorporate a support in the design of my stands. The finished pieces though, are works of art. Very clean and accurate.
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