Ultimaker Robot Supported
Originally designed by Curt Roth, this Ultibot has been included as a standard file in a lot of Cura releases. It had been removed during a rebrand but it still has a special place in the heart of a lot of employees.
It even has its own dedicated page on the Ultimaker website highlighting the different places where you can still find this robot.
The original file, which still can be found in the source files, is not watertight. This version has been fixed and made solid, so you don't see the error when loading this file.