Drag to turn; right-drag, shift-drag or move two fingers to slide the view; scroll or pinch to zoom in on whatever is under the pointer; double-click a part to turn round it, and Reset view to go back. Draw Explode to take it apart. Every part is the cut file’s own outline at 3mm: the plain face with its round hole underneath, seven finger-jointed walls, and the septafoil rosette face on top. The sheet’s three optional stiffeners are left out, because nothing says where under the rosette face they go. The tines and bridge are not part of this build.