> For example if they tell you they do 0.5mm vias and you ask for 0.4mm vias and they ship you 0.5mm vias... who's in the wrong? You. Always. PCB programs AL

> For example if they tell you they do 0.5mm vias and you ask for 0.4mm vias and they ship you 0.5mm vias... who's in the wrong? You. Always. PCB programs ALL have design rule checkers. If you fail to use them, the result is all on you.