I did, the light originates from within the detector, I tested it on other ones with no problems.
If you turn the lights off in a room and close the doors and there's no windows, the smoke detector doesen't go off, so the idea of the new cap blocking all light crossed my mind but didn't make much sense in the end.
Can't seem to get another one to go off, perhaps the detector itself was faulty.
... maybe first Google how a photoelectric sensor works...
The original orange cap seems to be translucent, the black one you printed isn't! Don't play arround with smokedetectors, better be safe than sorry!
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