This is a freqiuently asked question, how to add jumpers to a single sided board. Here is one previous discussion with some suggestions. A search will find others.
I CNC mill more Single-Sided PCB’s than I care to admit and, when possible, I prefer using Jumper-Wires in lieu of making Double-Sided boards.
Graphic layouts can be helpful and, having No effect on circuits or PCB manufacture, jumpers can overlay on top of Ratsnest lines (in PCB layout) thus adding a missing link to layout concepts.
Attached zip file contains several Jumper-Wire footprints (.mod and Step files) for PCB:
8mm, 12mm 20mm 25mm, 30mm, 50mm
The File: JumperWires.zip (141.7 KB)
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