Three-dimensional printer, and three-dimensional printing method and device

Disclosed are a three-dimensional printer, and a three-dimensional printing method and device. The three-dimensional printer comprises a material tray (1), a shaping platform (2), a projector (4), and a movement mechanism. The movement mechanism comprises a horizontal movement mechanism (32) used for driving the material tray (1) to make reciprocating movement in the horizontal direction. A filtering mechanism (5) is disposed in the material tray (1). When the movement mechanism drives the material tray (1) to make reciprocating movement in the horizontal direction, the filtering mechanism (5) is used for making relative movement with the material tray (1) in the horizontal direction, so as to filter out solid residues in the material tray (1). The three-dimensional printer has a horizontal movement mechanism and a filtering mechanism; the horizontal movement mechanism can drive a material tray to move in the horizontal direction, thereby improving the mobility of a material; residues produced in a printing process can be filtered out by means of the relative movement between the filtering mechanism and the material tray, accordingly the effect of cleaning a printing material is achieved, and printing quality is improved while the utilization rate of the printing material is improved.