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I think this is etching
Drilling, not sure if mechanical or laser.
Nope… try again
It isn’t drilling.
Is this one of the after-drilling processes, like desmearing?
Depanelization
So are the individual boards split with a laser cut, rather than another routing or bending until they break?
The video shows Laser depanelization-cutting the boards out of an Array. Prior to assembly the boards are about 90% routed with only Tabs left holding them in place. The Tabs are cut away after assembly. This can be done Mechanically as well. This is a common practice as lots of materials like PTFE and more complex designs don’t do well with Bend to Break.