I think a tool that would allow you to hollow the inside of a block then let you run wires through the block would be really useful. It would help hide wires and be helpful for hooking up machines indoors.
Suggestion New block
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Isn't this what Facades are for? you make a "cover" of a block, then you place the wire, then you place the cover to hide the wire.
If you really need it inside a block, I believe construction foam can cover a wire as well. I don't recall if you can place a cover over construction foam / reinforced stone, but that would be a neat future capability.
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I'm not sure about a "cover" over construction foam, but there is the Obscurator:
https://wiki.industrial-craft.net/index.php?title=Obscurator
I haven't used it much myself, since I only play single-player and prefer to have my cables visible.
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I am pretty sure you can do that with a construction foam. You can fill blocks with foam while wires will stay there and preserve all conductive properties. https://wiki.industrial-craft.…p?title=Construction_Foam