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I think it would probably be worth looking into an 80w-100w lasers with larger cutting beds for you. There is a huge community around the Chinese Red/black style laser cutters that are a steps above the k40 but still significantly cheaper than other commercial/consumer models.
That will likely be what I upgrade to next.
I have not tried cutting pcbs with a laser cutter but I am sure someone has so the results are out there somewhere.
I have actually been looking at those larger, more powerful machines. It's a toss up for me whether I go with a small CNC machine of a larger laser cutter. I'm leaning toward to the larger laser cutter.
It is obviously unique to each person's use case but I have heard lots of anecdotal conversation around people getting membership to makerspaces to get access to CNC machines and end up spending the bulk of their time on the laser cutters.
I am a hobby woodworker so I think a CNC would be cool, but spend more time wishing I had a bigger laser cutter than wanting a CNC.
I have friends nearby who have a good quality 3D printer and a nice CNC mill. I'm heavily leaning toward the laser cutter.
I expect to see updates over in the laser cutter community!