Well, as I feared the horn extension has not weathered well. Stereolithography is fine for evaluating prototype parts, but for something that is going to be exposed to the weather, it just "doesn't cut it".
I recently painted it in hopes that it would help it last, but the process of trying to snap it on to the new sensor horn broke the attaching part into several pieces.
I have an inquiry into Maxbotix about whether they have started making a more robust version of it. If it is still 3D printed, I am not going to reorder one.
Greg H.