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This is a replacement autofocus (AF) button for Elmo tt-02* document cameras. (If your zoom knob is broken or missing, contact your Elmo dealer as the manufacturer sells a replacement for reasonable cost.) This is just the orange autofocus button that sits in the center of the black zoom knob. To install: look for slots inside the zoom knob and rotate the autofocus button 1/4 turn from these slots; insert the button into the knob; apply pressure while turning until the button clicks/locks into place. Since Shapeways reminds us that their 3D printed products are intended for decorative purposes, officially, this is a spinning top. A really bad one.