Abstract: In one aspect, the present application provides a method for fabricating shell-shaped dental appliance, comprising: generating a first 3D digital model representing an assembly of a support and a shell-shaped dental appliance, where the support has a first surface that conforms to and clings to a second surface of the shell-shaped dental appliance; and using the first 3D digital model to control a device to discharge successive drops of at least one fluid phase and solidifiable appliance material and successive drops of at least one fluid phase and solidifiable support material to form the assembly slice by slice along a first direction.