Conductive Paste on Plastic Channels

Drawback: conductive paste is 1000x less conductive than copper. Copper conductivity - 0.5 milliohm per square [1]. Cu Pro Cote is 0.1 ohm per square. [2]

See OSE 3D Printed Circuits

https://www.instructables.com/id/3D-Printing-3D-Print-A-Solderless-Circuit-Board/