If you have worked with electronics, at some point you have probably wondered or even tried to make your own PCBs at home. Thanks to the magic of 3D printing, that dream is now a reality. Stephen Hawes, CEO of Opulo, on his YouTube channel shows us how you can use an SLA 3D printer to etch your very own PCBs.
First, you'll need to design your circuit layout using software like KiCad or Eagle. Once you've got your design ready, it's time to prep a copper-clad board. This is the base material on which your circuit will be etched. Next, you'll apply a UV-sensitive photoresist to the board. This layer is crucial as it will protect the copper where you want to keep your circuit traces.
Now, here's where the 3D printer comes into play. You'll expose the photoresist to UV light using your SLA printer. Export your PCB into an SVG and extrude it for 0.1mm making it look like a 3D model and print it using your slicing software. The exposed areas of the photoresist will harden, while the unexposed areas will remain soft. This creates a mask that protects the copper traces during the etching process.
Finally, you'll immerse the board in a chemical etchant, like ferric chloride. This etchant will dissolve the unprotected copper, leaving behind your circuit.
While it might sound complex, this DIY PCB method is a fantastic way to experiment with electronics and bring your ideas to life. Just remember, precision is key. Factors like exposure time, etchant strength, and temperature can significantly impact the final result.
