looks great in laywoo-3D and your average PLA.front has a 14 mm. dimple to hold a custom insert (or simply a 3D printed 14 mm. flattened ball in a differen color)an stl for a simple 14 mm. ball was added ( TIP : lower the ball through the bed of your printer - cura setting - so it has a flat bottom, & to make it stable during print)