P3STEEL Tennis Ball Feet

For cancelling vibration of P3STEEL 3d printer on the table I designed tennis ball holder for trentjw's i3v Steel Printer Feet (http://www.thingiverse.com/thing:734448) There are 2 screw holes for combine ball and holder but I didn't need to screw. It holds nicely.
You need trentjw's i3v Steel Printer Feet (http://www.thingiverse.com/thing:734448) for using ball holder