Caig Labs CL-ETCH-16 Ferric Chloride PCB Etchant Solution 16oz Bottle

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Simple Boards - If all you need is a rough board for a limited application, it will certainly cost less.
Total Control- Do you want to make a circuit board out of unusual or extraordinary materials? Either your own creativity or the demands of an application.
Rapid Prototyping - It takes less than an hour to print a PCB yourself, so if you're going through a lot of designs, why wait a week or two for every new prototype?
Avoid the nonsense and make it yourself
Do it yourself and the limitations disappear