Question About Your Board Stack Example - Why Blind VIA is Different Size?

[jpartis1]

Can you please tell me why the blind VIA in the example stackup you use is bigger in size than the micro vias?

[mairomaster]

The blind vias in the particular stackup are mechanically drilled and they can't be practically manufactured with as small hole diameter as the micro vias (laser drilled).

[jpartis1]

Nice, thanks a lot for that, makes total sense! I knew there had to be a very good reason...