Learn How to Make a Printed Circuit Board at home using the Iron & Laser Printer method and Ferric Chloride Etchant.
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Once you have finished designing the board layout of your circuit in Eagle, go to Layer Settings and select Hide Layers.
Next, select only the following layers for a bottom layer only PCB:
Then go to File>Print. Set the Printer to Microsoft Print to PDF.
Ensure that the following settings are also selected: Black and Caption.
Click OK and Save the file in the destination folder of your choice.