Cornetto Muto (Mute Cornett)
by Gernreich, published
I did nothing but take his measurements and put them into stl files. The Cornett needed to be cut into four pieces to fit into my print area. To facilitate gluing the pieces together I created alignment cones meant to keep the pieces aligned in the X-Y plane during the glue up. These truncated cones are the negative space at the center of the Cornett. I glued each piece together with two part epoxy. To keep the internal alignment cones from getting glued as well I wrapped the alignment cones in silicone embedded parchment paper. Both the alignment cones and the pieces of parchment paper came out with no fuss.
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I play it on my youtube channel http://www.youtube.com/carnrig...
If you search youtube for Cornetto you will find people who can actually play the instrument. :-) I gave the one I printed to the gentleman who gave me the specifications. In his skilled hands you can tell it a bit breathy and not as warmly mellow as one crafted out of wood. But for a printed instrument I think sounded quite good when he played it.
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I have tried printing these both solid and with three shells and 15% infill. At .34, .15 and .10 My main goal is to get these pieces air tight. They were not entirely airtight so I coated the whole Cornett inside and out with a coat clear Shellac. When the Cornett is assembled the lowest note played should be A440.
I printed the alignment codes at 99.5% scale, 2 shells 5 percent infill, and .34 layer thickness.
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