An apparatus for shaping stents, comprising: a pressure vessel comprising: an upper plate comprising an upper plate opening passing through the upper plate; a lower plate comprising a lower plate opening passing through the lower plate; a central plate assembly comprising a central plate and central plate opening defining an inner perimeter, the central plate assembly further comprising a shaping balloon, the shaping balloon having a balloon opening and defining a balloon interior chamber, the shaping balloon passing around the inner perimeter of the central plate opening, the shaping balloon having an inflated configuration and a deflated configuration, the central plate assembly further comprising a fluid lumen in fluid communication with the balloon interior chamber; wherein the upper plate and lower plate and central plate are stacked together with the central plate positioned between the upper plate and the lower plate, and wherein the lower plate opening, upper plate opening, and balloon opening form a continuous mandrel-receiving lumen; and a mandrel comprising a mandrel longitudinal axis, the mandrel comprising an upper mandrel plate, a lower mandrel plate, and a central mandrel portion, wherein the upper mandrel plate comprises a shape configured to fit tightly into the upper frame plate opening, the lower mandrel plate comprises a shape configured to fit tightly into the lower frame plate opening, and the central mandrel portion comprises a shape corresponding to a desired stent shape, wherein the mandrel is sized and configured to be slidingly advanced along its longitudinal axis into the mandrel-receiving lumen. a pressure vessel comprising: an upper plate comprising an upper plate opening passing through the upper plate; a lower plate comprising a lower plate opening passing through the lower plate; a central plate assembly comprising a central plate and central plate opening defining an inner perimeter, the central plate assembly further comprising a shaping balloon, the shaping balloon having a balloon opening and defining a balloon interior chamber, the shaping balloon passing around the inner perimeter of the central plate opening, the shaping balloon having an inflated configuration and a deflated configuration, the central plate assembly further comprising a fluid lumen in fluid communication with the balloon interior chamber; wherein the upper plate and lower plate and central plate are stacked together with the central plate positioned between the upper plate and the lower plate, and wherein the lower plate opening, upper plate opening, and balloon opening form a continuous mandrel-receiving lumen; and a mandrel comprising a mandrel longitudinal axis, the mandrel comprising an upper mandrel plate, a lower mandrel plate, and a central mandrel portion, wherein the upper mandrel plate comprises a shape configured to fit tightly into the upper frame plate opening, the lower mandrel plate comprises a shape configured to fit tightly into the lower frame plate opening, and the central mandrel portion comprises a shape corresponding to a desired stent shape, wherein the mandrel is sized and configured to be slidingly advanced along its longitudinal axis into the mandrel-receiving lumen. an upper plate comprising an upper plate opening passing through the upper plate; a lower plate comprising a lower plate opening passing through the lower plate; a central plate assembly comprising a central plate and central plate opening defining an inner perimeter, the central plate assembly further comprising a shaping balloon, the shaping balloon having a balloon opening and defining a balloon interior chamber, the shaping balloon passing around the inner perimeter of the central plate opening, the shaping balloon having an inflated configuration and a deflated configuration, the central plate assembly further comprising a fluid lumen in fluid communication with the balloon interior chamber; wherein the upper plate and lower plate and central plate are stacked together with the central plate positioned between the upper plate and the lower plate, and wherein the lower plate opening, upper plate opening, and balloon opening form a continuous mandrel-receiving lumen; and a mandrel comprising a mandrel longitudinal axis, the mandrel comprising an upper mandrel plate, a lower mandrel plate, and a central mandrel portion, wherein the upper mandrel plate comprises a shape configured to fit tightly into the upper frame plate opening, the lower mandrel plate comprises a shape configured to fit tightly into the lower frame plate opening, and the central mandrel portion comprises a shape corresponding to a desired stent shape, wherein the mandrel is sized and configured to be slidingly advanced along its longitudinal axis into the mandrel-receiving lumen.