The bCNC is the application that connects to the Arduino GRBL.

(Note: although I do not believe that the CNC is the best way to produce a PCB, I assembled a CNC to study and would like to try this process.) The question is how to generate “negative” vector of _xxx_etch_copper_bottom_mirror.svg image, ie, vectors forming where the image content is white. In this case we want to cut which is white but white is just the image background, is not a vector. In _xxx_etch_copper_bottom_mirror.svg graphic, cut where it is black, where we do not want to cut. The CNC “cuts” where there is a vector in the image. The graph of this SVG layer containing the vectors in the proper format for PCBs but not appropriate to generate the gcode used by a CNC, that is, this graph would have to have the “inverted” vectors in the image: the vectors should be present where the image is white. The Fritzing can generate a set of vectorial SVG graphics for the production of PCBs, among which is especially important _xxx_etch_copper_bottom_mirror.svg graphic to “print” the botton layer. I think that I did not properly formulated this question considering that this is a vector image and I might not get me adequately express in English I apologize. Inkscape can be a tool to change the vector graphic color, but can also be used “Developper tools” from Google Chrome to edit the color of each component vector of the image SVG … but change the vector color does not solve the problem. You answered my question, I thank you for your attention.

Diptrace pcb milling