an injection station including a platform and an injector disposed over the platform, wherein the platform includes a first opening extending through the platform;

a molding device disposed between the platform and the injector and over the first opening, wherein the molding device includes a mold cavity and a clamping unit for clamping the molding device; and

a plunger disposed under the platform and molding device and movable into and out of the injection station, wherein the plunger includes a base and a rod, the rod is extendable through the first opening to contact the molding device and retractable toward the base and away from the molding device,

wherein the molding device and the clamping unit are movable together relative to the platform, the plunger is disposed out of the molding device,

the molding device is disposed between a first mold base and a second mold base disposed over and engageable with the first mold base, and is surrounded by the clamping unit, and

the first mold base is disposed between the clamping unit and the platform when the molding device is disposed on the platform.