A cooling system for cooling a three-dimensional (3D) printing medium is provided. The cooling system includes at least one cooling device configured to be inserted into the 3D printing medium and to remove heat from a 3D printing medium via a fluid, at least one brace configured to support the at least one cooling device in the 3D printing medium, and a refrigerator configured to be fluidly coupled to the at least one cooling device and to cool the fluid.