Implantable objects fabricated by additive manufacturing and methods of fabricating the same

A method of fabricating a stent comprising:

• forming one or more stent struts by:
• melting a powder comprising at least nickel and titanium by delivering energy to the powder at a first energy density from an energy source;
• and
• iteratively forming a plurality of stacked metallic layers from the melted powder using additive manufacturing;
• and
• forming a support surface by:
• partially fusing the powder by delivering energy to the powder at a second energy density from the energy source, wherein the second energy density is lower than the first energy density from the energy source;
• and
• iteratively forming a plurality of stacked support layers wherein each support layer is formed from the partially fused powder using the additive manufacturing, wherein the support surface has a porous structure and is formed as one or more sacrificial sections interleaved between adjacent ones of the one or more stent struts, the one or more sacrificial sections being configured to support the one or more stent struts during the fabrication of the stent and to be removed by a surface treatment that dissolves the support surface,
• such that the stent is biased to expand from a first configuration to a second configuration when at or above a phase transformation temperature.