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Citing a "police raid" and making links to gangs is just a dramatization that doesn't bring anything.The article notes that the parts were seized as a part of the Greater Manchester Police's "Operation Challenger", which targeted "drug dealers, loan sharks, rogue landlords and counterfeit good suppliers." [1] It is likely that the owner of these parts is was not targeted for creating guns on their 3D printers, but for other reasons.
> Where's the evidence that there is a link to a criminal activity instead of just being a hacker who's curious and got busted because he order the wrong set of components from Amazon ?
I think it is extremely doubtful that they just happened to buy plastic components that could be used as a trigger and magazine from Amazon while simultaneously owning a 3D printer (that could be used to construct said components).
[1]: http://www.bbc.co.uk/news/uk-england-manchester-24660056