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I was considering the possibility to 3D print some capacitors with various forms and shapes in order to test them. I need to be able to print both the non-conductive and the conductive materials at the same time so I have the following questions:

  1. I suppose that since I need to do multi-material printing, i will have to stick with FDM. Is that correct?
  2. I have seen that there are some PLA materials that are mixed with dust of metals and become conductive themselves. Do they become also capacitive? Are there any better options for a conductive material in a multi-material scenario?
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  • $\begingroup$ This might be a better fit over on EE.SE; Someone can likely answer the printability questions here, but the capacitive properties of the materials is a little beyond the average "maker". $\endgroup$
    – KeithS
    Commented Jan 13, 2020 at 18:18
  • $\begingroup$ Even if you succeed in printing without any shorts, you are going to have horrible reproducibility problems. Further, I doubt most PLA/ABS/whatever materials have a dielectric constant of any useable value. $\endgroup$
    – Carl Witthoft
    Commented Jan 13, 2020 at 19:02
  • $\begingroup$ There is Proto-Pasta's Conductive filament... no experience with it but you should use a 2-extruder setup, which contains "conductive carbon black", a form of very finely powdered graphite. proto-pasta.com/pages/conductive-pla $\endgroup$
    – Trish
    Commented Jan 20, 2020 at 13:18
  • $\begingroup$ in the end i bought the Proto pasta conductive filament, and measured it. resistivity is what is advertised (3KOhm/10cm). The filament has also capacitance. i printed 2 sheets 2cmx2cmx1mm and whith a piece of paper in between i measured 0.1nF $\endgroup$
    – Yann
    Commented Feb 5, 2020 at 11:48

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Someone has already studied this: study of electrical properties of 3D printed materials.

ABS: dielectric constant about 3. PLA: 2.7-2.9.

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