You can design, print and etch your own PCBs from a flexible sheet of Kapton coated with a thin layer of copper. To do this yourself you need some special materials and equipment, and if you are not planning on etching circuits more regularly then it can be nice to start by looking for a local space that has an etching setup you can use.
Photo of a flex circuit etched using the exact same process as described below in step-by-step detail.
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