Vibration is one of the reasons I haven't made plastic printed light brackets. Not that they would break from fatigue, but they would vibrate enough to be an annoyance to oncoming traffic and the rider. All too often I see aftermarket and even OEM fog lights on cars and trucks that flicker bc the bumper cover flexes so much. With LEDs it doesn't take much movement to see it and be dazzled or annoyed by it, let alone take a bump or pothole. I think with the right design they could be done, but I don't think the ones shown by Rogo would hold much weight firmly.I like the idea of under mirror light brackets and those in particular. But I wonder how well 3D printed kit would hold up under some weight and constant vibration. Some plastic house LEDs might not be a problem but some of the nicer kit have metal housings and have a bit more heft.
Another reason is I don't like cutting/drilling into plastic. Others are okay with it, but I'm not willing to test on my bike before I offer it to the world. Plastics are hard enough to come by. I'd hate to ruin a finish piece for something that would cost a tenth as much. Not worth it to me.