BGA, Min track/spacing

Engineer asked Jun 19,2024

I ordered PCB prototype. My PCB has a BGA IC.

When I used the online calculator, the price was about $84.

After reviewing by PCBWAY engineer, the price was changed as about $258.

BGA ball spacing is 15mil. the spacing between ball and line trace is 5mil.

the line trace is 5mil.

With these spec, will the Price be increased ?

In the online calculator, Min track/spacing was 5/5mil,

The engineer said that the price was increased because the Min track/spacing is 6/6mil=0.15mm.

My design specification is 5 mil.

I don't understand why the price is increased.

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