A lot of people print them. The keys are using the right filament and minimizing stress risers that can lead to cracking over time from engine vibration. Filets and chamfers on the 90-degree transition from the flange to the main body help. These are the extensions I printed for the carbon fiber air horns I used on the Jenveys fitted to my Caterham nearly 3 years ago and are similar to my original plans for the Omnitech air horns.
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