Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Geometric illustration of the 3D printing head where a central cylinder intersects with the plane (ALB). a,b) Schematic diagram of the 3D printing head with an ellipse at the intersection. c) The position of the movable mechanism on the XOY plane. d) Top view of the ellipse, which is an intersection of plane ALB and the cylindrical surface passing six points (A, A’, B, B’, C, and D).
