Methods for making an object and formulations for use in said methods

A method for creating a 3-dimensional object, the method comprising forming more than two layers of a cured polymer by exposing a liquid photopolymer formulation to light emitted by a liquid crystal display (LCD) screen, wherein the liquid photopolymer formulation comprises:

• at least one monomeric and at least one oligomeric chemical species each comprising at least one carbon-carbon double bond that is polymerizable by free radical polymerization, said monomeric and oligomeric chemical species present in a total amount of from 25 to 99 wt %;
• at least one titanocene photoinitiator present in a total amount of from 0.1 to 2.5 wt %;
• at least one thiol co-initiator present in a total amount of from 0.5 to 5 wt %;
• and
• optionally at least one pigment or dye,
• wherein the at least one oligomeric chemical species comprises:
• 40 to 75 wt % aliphatic urethane acrylate oligomer comprising three acrylate groups;
• and
• wherein the at least one monomeric chemical species comprises:
• 20 to 45 wt % other monomeric species comprising at least one carbon-carbon double bond that is polymerisable by free radical polymerization.