With your art graphic in a KiCad library, you are ready for the process to turn it into a PCB! Yay!
If you don't already have a project, click File -> New Project. Select the name representing your design.
Go back to the main KiCad menu and click on PCB Editor (the green one).
The PCB Editor looks like the screen below:
Near the upper right is an icon of a chip. That is the Add a Footprint tool. Click it and you get a window to select a footprint. Select your footprint library and your design.
Place it in the center of the PCB editor window.
Zoom out if necessary to see your entire sheet.
Generally, that's it, you can save your design into a file that should end in a .kicad_pcb file extension. Making multiple copies of the design in the PCB file are not needed - you can specify how many you want with the board manufacturer.
Creating the Gerber and Drill Files
While some PCB manufacturers can take a KiCad data file directly for a design, the introduction of KiCad 7 in 2023 has some manufacturers behind on supporting the new file format. No worries, we'll export the files needed. Select File -> Fabrication Outputs -> Gerbers shown below.
Use the Plot button to generate the Gerber files. I recommend making a subdirectory under your project to put them in. After that press the Generate Drill Files button. Save the files in the same directory as the Gerber Files.
These files describe exactly what each layer should have with the drill files showing the exact place to have holes drilled.
Go to the directory with all the generated files. Zip all the files into one Zip file package. If a board house cannot use KiCad 7 files, they will definitely use the raw files, most often sent in a single Zip file.
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