Making rosettes to surround the sound hole is a tedious job. I thought I would make a bunch of them at once and get it behind me. So here are the ingredients, a nice piece of scrap spruce, a compass and a measuring device
Scribe the outside diameter of your Rosette
With this little saw I cut about a million pieces of spalted maple from the strips that are fed through this sawing guide clamped to the workbench
Now, using superglue, attach those triangular bits of wood to the circles you have drawn on the spruce.
At last the circles are all complete. Beside the glue has set before you take the next step
Now you run the rings through the thickness sander, slowly sanding them down flat.
Now you drill the center hole to accept the 1/8th inch pin around which the Dremel router will turn to cut the final dimensions of the rosette. Set the router to not quite cut through the spruce backing. Once you have cut the rosettes you simply turn the whole works over and sand away the spruce backing until the completed rosette is freed.