Took my 3mm thick FC plate to fablab where they have nice cnc router, wanted to cut out some arms for quadcopter frame. All went well but the router bits did not last long. I never used that sort of machine before, so i have few questions, first of what kind of bit i should use for CF ?

I am just starting out with a handheld router and carbide bit with good results on the test piece last night.  Edge is smooth as can be, no damage to the surface either, keep in mind the bit is brand new though.  I was testing on 6mm thick CF 

https://www.toolstoday.com/solid-carbide-carbon-graphite-and-carbon-fiber-panel-cutting-router-bits.html?variantids=12012,0&keywords=46264