Resin materials for making three-dimensional objects and methods of using the same

A polymerizable liquid used for producing three-dimensional objects by methods of additive manufacturing, said polymerizable liquid comprising:

• a blocked or reactively blocked polyurethane prepolymer;
• a blocked or reactively blocked curing agent, wherein the blocked or reactively blocked curing agent is a diol compound with two hydroxyl groups protected, a diamine compound with two amino groups protected, or a diimine compound with two imino groups protected;
• and
• a photoinitiator.

A method for forming a three-dimensional object, comprising:

• providing a printing region defined by a forming platform and a resin reservoir having a forming surface;
• filling said printing region with a polymerizable liquid, said polymerizable liquid including a blocked or reactively blocked polyurethane prepolymer, a blocked or reactively blocked curing agent, and a photoinitiator, wherein the blocked or reactively blocked curing agent is a diol compound with two hydroxyl groups protected, a diamine compound with two amino groups protected, or a diimine compound with two imino groups protected;
• exposing said printing region filled with the polymerizable liquid to energy to form a solid printing intermediate having substantially a same shape as said three-dimensional object;
• and
• providing energy to said solid printing intermediate to form said three-dimensional object.