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 :) .

                                                 Layer 1 - TOP , with components.

            Layer 1 - TOP , with components and  with the component designations.

                           Layer 1 - TOP ,  with the component designations.

                                          Layer 1 - TOP , without components.

                                                 Layer 2 - Inner layer.

                                                     Layer 3 - Inner layer.

                                             Layer 4 - BOT , with components.

               Layer 4 - BOT , with components and  with the component designations.

                             Layer 4 - BOT ,  with the component designations.

                                       Layer 4 - BOT , without components.

              Components : TOP and BOT , wthout picture : component designations.

                                       Components : TOP and BOT .

                        Components : TOP and BOT + component designations.