Here's an Eldar Webway Gate. You can print it out in one piece or try printing it in four segments. If you do print it in four pieces you might want to use some filler, such as caulk or glue, for the crevices between the joining parts.
UPDATE - 01/05/19
• Adjusted proportions and shape.
• Added additional detail to lower half.
• Increased model accuracy.
This creation is modeled after Dawn of War II's Eldar Webway Gate.