ALL PCB - Stackups

[mrpackethead]

If you need a known Stackup for your project, then its good to know what it is before you start.
I was able to get this from Allpcb recently.   Many fabs seem just to say 'yeah yeah, we will make what you ask for', but sometimes pick the 'closest' one and hope its all good.
In many cases you'd get away with that, but if you want controlled impedance tracks.. not so much.