/diy/ - Do It Yourself

>>1733338
>But those 0.3mm pitch boards are done by industrial etch systems, right
the operative word is systems, that monitor and correct themselves, and as a general rule don't have to deal with fingerprints or other variables
like all wet chemistry, it's a matter of knowing what you're working with. if you're reusing a bath of partially spent FeCl3 from the last run without any analysis or treatment, the terrorists have already won. (one of the advantages of CuCl2 baths is that they can be titrated and adjusted very easily)

>>1733339
lucky drill hit, sharp bit, drill didn't hit the glass cloth in just the wrong place, drill polished the hole on the way out
just accept it as god's will and follow Her design rules