Compact toy traffic light

Worth knowing

About 10.7 kg of filament with two computers and 12.5 kg with four (roughly 360 to 420 hours on a fast printer), in two colours: yellow for the housing, the head and the inner wall of the head, and black for the light boxes, the visors, the collars, the cable ducts and the head's floor plate. Print the light box tiles and the collars face down on a textured sheet so the black comes out matte. The head is printed in nine cells with a thin roof skin and glued together, so handle it with care. The visors are glued on by a narrow flange; they are decoration, never lift the traffic light by them. They stick out 80 mm and a hard knock can snap them off. The head (plate, cells, inner wall and its two collars and visors glued into one) is not glued down because it is the way in; lift it straight up with both hands under the edge of its roof, never by the visors. It needs two 1 m LED strips, one for each half of the inner wall, and one 2 m strip in each light box; the light box cable runs down a small black duct into a plinth vent. The lamps glow amber, not red, and the lower two only dimly; it is a night light effect, not a real signal lamp.