A method of forming a three-dimensional object comprised of polyurethane, polyurea, or copolymer thereof, said method comprising:
- (a) forming a first intermediate object from a first polymerizable liquid, said first polymerizable liquid comprising at least one of:
- (i) a blocked or reactive blocked prepolymer, a blocked or reactive blocked diisocyanate or branched diisocyanate, or (iii) a blocked or reactive blocked diisocyanate or branched isocyanate chain extender, with said first intermediate object having the same shape as, or a shape to be imparted to, a first portion of said three-dimensional object;
- (b) forming a second intermediate object from a second polymerizable liquid, said second polymerizable liquid comprising at least one of:
- (i) a blocked or reactive blocked prepolymer, (ii) a blocked or reactive blocked diisocynate or branched diisocyanate, or (iii) a blocked or reactive blocked diisocyanate or branched isocyanate chain extender, with said second intermediate object having the same shape as, or a shape to be imparted to, a second portion of said three-dimensional object;
- then, in any order:
- (c) optionally washing said first intermediate object and/or said second intermediate object;
- and
- (d) contacting said first intermediate object to said second intermediate object;
- and then, following said contacting and/or washing step:
- (e) heating and/or microwave irradiating said first and second intermediate objects while said first and second intermediate objects are in contact with one another to couple said first and second intermediate objects to one another and form said three-dimensional object comprised of polyurethane, polyurea, or copolymer thereof;
- wherein at least one of said forming steps (a) and (b) is carried out by:
- (i) providing a carrier and a fill level, said carrier and said fill level having a build region therebetween;
- (ii) filling said build region with said first or second polymerizable liquid;
- and
- (iii) irradiating said build region with light to form a solid polymer scaffold and advancing said carrier away from said fill level to form said first or second intermediate object, with said first or second intermediate object containing said (i) blocked or reactive blocked prepolymer, (ii) blocked or reactive blocked diisocynate or branched diisocyanate, or (iii) blocked or reactive blocked diisocyanate or branched isocyanate chain extender.