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Md Abu Nayeem , 02-17-2026, 12:42 PM

Hi everyone,

I am new to Altium.
I am facing an issue while trying to do fanout in Altium using Constraint Manager, and I’m stuck at this point.

Here’s what I’ve done so far:

I have created the Room for the BGA.

In Constraint Manager, I have created the clearance rule for that Room, and also defined the width and via style.

Fanout is not working.

Then i tried routing a net manually — the clearance is getting updated according to the Room rule while routing, but after routing I’m getting errors.

So basically:

The rules seem to be partially applied (since clearance changes during routing).

But once routing is completed, DRC throws violations.

The automatic fanout command is not working as expected inside the Room.

QDrives , 02-18-2026, 12:45 AM

Is that clearance rule for "same nets" or "different nets"?