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In search of DIY-able substrate. Have amounts of scrap copper.
Thought about electroless copper plated plywood even.
Just for lulz tried (and failed) to make toy stuffing+PVA composite (won't cure without air). That was my debute in tech parody genre

For proper FR4 can't find an open design of a fiberglass weaver. (need to make one?)

Target characteristics need just to be enough for RepRap-level electronics (mm range trackwidths and separations and enduring a low temperature soldering session).

@houkimenator Get an auto body repair kit with epoxy and fiberglass to experiment with. Theoretically you could trowel out the mixed epoxy and fiberglass, between two sheets of thin copper sheeting and press it to the desired thickness.

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