How do I make a slot in a pipe?

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Slainte Mhaith

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I have a piece of stainless steel pipe and want to make a 3mm slot in the length of the pipe on both sides (straight through)

How??

Drill a hole and mill from there?
Heard of slot drill and end mill.
Not sure it will be strong enough for the stainless steel?
Laser cutting?

Accuracy about 0.1-0.2mm required. Thus not too accurate.
 
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