This is a print from my Da Vinci 1.0, and I painted the extruded logo with white acrylic paint. (Was originally planning on using two coats of white nail polish). I put a pilot hole in the bottom of the model because I wanted to drill the hole for the guitar knob stem afterwards. I am worried it will slip so I am filling the space with Gorilla Glue and then will redrill a smaller hole, hoping the sponginess of the glue with be enough friction. I printed it at two inches wide. Addendum: The second stl file here "cover" is a chunkier version and instead of pilot holes on the back, I modeled in a big enough cavity so that it will fit snugly over an existing, smaller guitar knob so that the final piece has proper threading. The model is oversized so I have been scaling it down in my XYZ software. At 5.2cm, the most recent print was a perfect fit to cover a small guitar knob.