Can I print plastic blank space fillers for my service panel?
One more step
You'll need to send several specimens of your 3D-printed cover plate to Underwriter's Laboratories along with a $5000 check, and have them &quot;UL-Classified&quot; for the panel in question. You'll be able to 3D-print the &quot;UL-Classified&quot; mark on the cover plate once you have that certification.
What UL will do is give it a variety of tests to make sure it won't accelerate a fire and will actually contain a panel fire, which is its primary job; will hold up to prodding by a 5-year-old who wants to see what's inside the magic box; won't go brittle and fail over time (least; they'll bomb it with UV light), and if forced to burn by an externally applied fire, won't off-gas toxic gases of some kind.