After successfully reverse engineering a two-layer board, I wondered: can I do the same with a four-layer board? I chose a four-layer board with larger components: SMD resistors and SMD capacitors no smaller than 0805. The board is automotive-grade: for AdBlue pump control.

For this project, I used Sprint Layout 6.0 — I didn't use Inkscape for the design.

Unfortunately, so far I haven't been able to locate the files I created with Sprint Layout 6.0.

I'm attaching photos. The board is 4-layer and quite thick: it took quite a bit of sanding to get through it :) .

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