I spent a fair while making my first attempt at a double sided PCB today for my extruder controller using my own design. It's been an interesting process as I've usually stuck to single sided or multi board designs for simplicity -- but along with the move to SMD components comes the desire for 'small' boards.
I'm actually reasonably happy with the result and I think it shows what can be achieved when milling boards on a CNC. The traces above vary from 0.8mm down to 0.4mm where absolutely essential in part to see how the traces turn out when the CNC is setup carefully. There are very few milling errors on the above boards, quiet a few design issues - but the milled boards look good (IMHO).
It's worth mentioning - I never actually expected to 'use' these boards, in part as I don't currently have any of the thin PCB usually used for double sided boards, and I always intended to use this 'print' to evaluate and fine tune the design. The drill bit's I've ordered have also 'gone missing' in the post, so a lot of the holes above are way out of spec.
I'm glad I took this step prior to having the a board manufactured... - Full Post
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