Sprue (manufacturing)

A sprue is a large diameter vertical channel through which liquid material is introduced into a mold.

Sprue also refers to the material that solidifies in these passages, forming a framework that attaches the parts in a roughly planar arrangement.

The sprue is a large-diameter channel through which plastic flows, usually around the edges of the part or along straight lines.

Hobbyists typically remove the parts of a model kit from the runner using a sharp craft knife or razor saw.

The sprues usually form a rectangle with the runners and parts inside which makes them easier to box.