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Here are the steps to do a four-layer board.

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The first step is milling of the copper artworks on layers 2 and 3.

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Then, the multipress laminates the top and bottom layer onto the layer 2 and 3 panel.

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The next step is drilling the holes with the LPKF protomat.

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Now, plate the holes with the LPKF electroplating system contact or mini-contact.

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The last step is to engrave the copper artwork on the top and bottom layers of the multi-layer board with the LPKF Protomat.

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Average process time for a four-layer board is only two hours.