Raise3D Wheel Cup

This is a wheel cup for the Raise3D printers. I noticed that the printer shook above 50mm/sec. I also didn't like the idea of an expensive printer being on wheels on a desk, even though the wheels lock. These are wheel cups that cradle the casters at the four corners. 1mm thick self-adhesive rubber sheet from craft stores was put on the bottom to aide in grip. It has noticeably reduced shake and makes the printer much more secure.