> My suggestion was to change the clearance class of your MLF footprints > (not the clearance class of the new traces to route) to the new > created clearance class MLF. > Please read my previous answer again more carefully! > After creating the new clearance class MLF change the matrix entry > between the new created class MLF to the class default to a lower value. > Then assign the new clearance class to your critical MLF footprint for > example by selecting a rectangle around these footprints, then pushing > the clearance button in the toolbar and selecting the new clearance > class MLF in the sheet, that pops up.
Yes, that's *exactly* what I did before my OP, and it doesn't work. The reason it doesn't work is because the autorouter is trying to use "kicad-default" traces to connect to the pins, and "kicad-default" uses the "default" clearance. At the point where two adjacent pins are connected to the tracks, the two tracks require "default"-"default" clearance. Since that's 12 thou, only one of the tracks can be laid. I can understand why you might think what you suggest will work; I must have been tinkering with this for an hour or more before the penny dropped why it doesn't work. Regards, Robert.
