THREE-DIMENSIONAL PRINTING PROGRESS VERIFICATION METHODS AND APPARATUSES

摘要

Three-dimensional printing processes are disclosed which include at least one of a step of determining satisfactoriness of a powder layer (22) prior to printing and a step of determining the satisfactoriness of a print bed after the powder layer (22) has been printed upon. If at least one of the powder layer (22) and the print bed are not satisfactory, then the three-dimensional printing process is halted and, optionally, the operator is alerted. Three-dimensional printing apparatuses (120) suitable for carrying out the processes are also disclosed.