Holy **** this is cool! How does that etching work? Can you explain a little about the PCB production?
Edit: Can you also post the link to the GitHub?
In GitHub until details of the first keyboard on the second publish after I finish working on it.
Brief description of the process of manufacturing the boards:
1. Adhesive tape stuck on copper;
2. Carved in FabLab 40W laser contour paths;
3. Immediately removed the excess tape with a knife (if at a later time, the glue will stick to the board);
4. Cleansed with absolute alcohol;
5. Etch the ammonium persulfate (you can ferric chloride) for 40 minutes per charge;
6. Removed the knife remains of the skin;
7. He took off residual adhesive nail polish remover (acetone can), washed in water;
8. With the Dremel 3000 drilled holes (plus Dremel Workstation 220) 1 mm, 1.5 mm, 3.2 mm (and then drilled holes on top of 3.2 screwdriver 4.5 mm, 4 mm was not enough due to inaccurate manual work) ;
9. Cut out with scissors, metal contour board (this is the most difficult thing was);
10. To tin with liquid tin (an aqueous solution of a tin salt).
11. inserted fee on the inserted into the body of a button, and all soldered.
12. After soldering rang multimeter all adjacent tracks, at one point had to remove the closure of tracks.