[HansHamster]

> When you send your design to pcbway or jlcpcb they have much tighter control over the process, so you no longer have to worry about this stuff.

Funny that you mention jlcpcb. The last time I submitted a board with tight differential pairs (but still within their listed specs) to them they basically told me to increase the amount of copper, so I assume they had some quality issues in the past:

> we have new rule since Dec, 2022, if the copper areas are less than 30% of the board in each copper layer, the space between trace and trace should be at least 0.15mm to avoid short circuit.

So I had to add a few copper pours and everything was fine :)

[neltnerb]

Arguably, the fact that they knew in advance exactly what you would need to do to avoid the issue means their process control is incredible!

[duskwuff]

And that's one of the benefits of working with a high-volume prototyping service like JLC - they've built a lot of PCBs; they know all about how to maximize yield.