Press one, the other lifts. Push down on one cratered dome and its arm tips on a shared axle inside the center frame. The linked arm on the far side swings the opposite way, raising its dome through the open window. One motion in, one motion out, no motor or battery anywhere in the mechanism.

Three pieces, one shared pivot. Lunar Relay comes as three pieces: the center frame with its molded pivot post, and two dome-and-arm halves that hook onto that post from opposite sides. Press the halves onto the post by hand, no glue and no tools, and the two arms rock against each other on the shared point.

Fit, finish, and size. Lunar Relay measures 3.6 by 2.1 inches and stands 0.98 inch tall, about 0.067 lb in PETG. The pivot post and dome arms are sized for a snug hand-press fit, no glue needed, and the printed layer lines run in fine, even bands across every dome and edge.