I needed a 16mm Futaba servo horn for an RC helicopter build, and had a pack of the small D type horns laying around. Designed these adaptors to suit. I have printed the 16mm version in ABS+ for temperature resistance and strength.
I glued the adaptor to the horn with CA. CA can be a bit brittle, so I think 2 part epoxy is a better choice and will use that for the next ones. You could also use tiny screws through the horn into the adaptor for added strength if you application requires it.
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