Powder Bed 3D Printing for Multi-Material Layer Sintering

The invention extracts the unsintered powder removal function from the bulk layer and applies it locally at the piston surface. By positioning the powder removal mechanism directly at the interface between sintered and unsintered powder, thick layers are cleared efficiently through localized action rather than attempting to remove the entire thick layer at once.

The piston performs preliminary displacement to position the unsintered powder layer for optimal removal. By pre-positioning the powder layer through controlled piston movement before the actual removal operation, the system prepares the powder for efficient extraction, enabling effective clearance of thick layers that would otherwise be inaccessible to suction or blow away methods.

The system implements self-service powder separation through the piston displacement mechanism. As the piston moves vertically, powders of different diameters naturally separate due to their different settling characteristics and flow behaviors during the displacement process. This self-separation eliminates the need for complex external separation equipment while maximizing powder reuse efficiency.

The invention creates equipotential conditions for powder separation by maintaining uniform gravitational and vibrational fields during piston operation. Under these controlled conditions, powders of different diameters achieve equilibrium positions based on their physical properties, enabling automatic separation without additional energy input or complex separation mechanisms.