A powder delivery device for providing raw material powder to a powder application device of a powder bed fusion apparatus is provided. The powder delivery device comprises a powder supply section configured to receive raw material powder, the powder supply section comprising an outlet for providing the raw material powder to the powder application device. The powder delivery device further comprises a first physical parameter determining unit arranged at a first location of the powder supply section and configured to determine a first physical parameter in the powder supply section, and a controller configured to determine whether the first physical parameter meets a first tolerance criterion, and a powder treatment unit. The controller is configured to instruct the powder treatment unit to perform a powder treatment in case it determines that the first physical parameter does not meet the first tolerance criterion.