On Tue, Aug 28, 2012 at 11:24 PM, Forrest Christian wr= ote: > I'm still trying to work with them to figure out if they can either fix t= he > problem with their supplier, or if I can do something to specify slightly > better quality. Honestly, it looks like they are now using a supplier > which is using 'scrap' FR4 as their base (this is 100% speculation - but > would account for almost everything I'm seeing). I'm not that picky, bu= t > I do need boards which are actually 0.063 thick and are flat, as opposed = to > seemingly random thicknesses 'around' 0.063 and quite warped. Forrest, Do you have a somewhat equivalent amount of copper coverage on either side of the board? I have made boards before with a flood fill on one side and a few traces on the other. They can easily be quite warped if they are of reasonable dimensions. --=20 Martin K. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .