Hello. I may have an opportunity to produce some replacement parts for vintage (and diy) tube microphones.
The tubes can run in excess of 700 volts and the circuitry is very sensitive to interference.
The originals were either acrylic or injected plastics. There is some thought that the type of plastic may have some interplay with the final sound of the microphone.
The plastic probably has an effect on the sound in much the same way that the construction and materials used for a Violin affect the sound.
Cured resin softens up quite a bit when it gets warm. Vacuum tubes tend to dissipate a fair amount of heat. This may be a problem depending on what you’ll use the printed parts for. I just put an Ohmmeter on a piece of Tough V4 print and it reads open circuit. I have an insulation breakdown tester somewhere that’d tell us the dielectric constant of the cured resin. But I expect it’s at least as high as air and probably higher… electrically it’s unlikely to be a problem.
Using the ASTM D149 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
The breakdown voltage can be approximated at 100kV/mm
Let me know if these are helpful and what sorts of values you’d be looking for.