About this 3D model

Print the front and back, and align and stick them together. A mounting peg works with a command strip to stick to a wall. Total diameter is 170 mm. Works best with a clock mechanism with an 8 mm shaft diameter (5/16 in), 8 mm shaft length (5/16 in). I used www.amazon.com/gp/product/B07T7HHJR2 for mine. The hands of the mechanism typically need to be cut to fit.