Differential pair width and spacing not matching defined values

[rayan]

I’ve already set the net class and specified the differential pair parameters (such as trace width and spacing) in my design. However, after routing the differential pairs, I notice that the routed traces are not consistent — both the trace width and spacing show different values than what was defined

The defined values were a 0.1 mm trace width and a 0.3 mm differential pair gap. However, irregularities were observed—while some traces measured correctly at 0.1 mm and 0.3 mm, others showed different values than specified

[paulvdh]

Why are you listing so many things separately? Looks like around 12 different net classes, and all nets in a netclass entered manually. You can use wildcards in the netclass assignment patterns such as “MDI*”.

KiCad also does not always use netclass settings during routing. That can be controlled with a few icons in the upper left corner of the PCB Editor.