ProffieBoard v3.9 creation knowledge

Hey all,

Wanted to look into getting some proffie pcbs made and wanted to know what to look out for with the v3.9 when it comes to manufacturers. Notably, Blind bias being a restriction. Any other things to be aware of? Somewhat of a noob.

Blind vias, and also vias-in-pad, which means that vias needs to be capped, filled and flat.
The hardest part is testing. It’s difficult to know that everything works…