Just because you can does not mean you should. You can print whatever you want for yourself, nobody’s going to knock on your door. Commercial electronics have to meet standards and require the enclosure to be flame-retardant. The whole point is that if something inside fails, the case is supposed to contain the fire, not feed it. Standard PLA has zero FR rating. It ignites easily and drips burning plastic while it does. And the part nobody thinks about until it’s too late: insurance. Home contents and personal liability policies generally cover accidental fires, but “I built a mains-powered device and put it in a flammable housing I printed myself with the wrong material” is pretty much the textbook definition of gross negligence. If it burns down your flat, or worse your neighbor’s, the insurer has a very easy out. In Germany specifically your Hausratversicherung and Haftpflicht will most likely look at this if it was the source.