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Looks like you get at a very good and even result from your flaring tool I do understand why you would like to use the 3D printed tubes, but I'm not sure they will withstand the heat from the engine ....
Tell us more! From existing schematic or your own design? What are the specs? (input voltage, output voltage & current level per plug circuit).
Awesome. I'm going to need something like that for my (Ohrndorf) 5-cyl glow radial. I have the LiPos & charging gear. I assume you designed the circuit yourself because I haven't seen one quite with those specs. Good luck with the Edwards start, keep us posted. Happy Holidays.
Thank you for the schematic - but I'm sorry to say that there's an error (or five) on it as all the 2N2905 are wrongly connected - or should I say that you have swapped the Collector and Emitter pins on them There's also the possibility that the symbols are wrong in the library for the software Best wishesPer