A cut-off saw includes at least one cooling air path through the interior space of the saw housing. The path enters the saw housing via at least one of a housing rear inlet opening and a housing side inlet opening. Upon exiting the saw housing via at least one of a housing side outlet opening and a housing front outlet opening, the exhausted air forms an air curtain that moves dust away from the front end of the saw.

An improved apparatus and method are provided to remove powder from a web, for example, in a 3D printing apparatus. A flexible blade is provided to contact and move across a first portion of the web located between adjacent portions of the web to scrape powder from the first portion without removing powder deposited on the adjacent portions. A pair of edge vacuum nozzles and a central vacuum nozzle are also provided to move with the flexible blade to remove powder from both edges of the first portion and a central region of the first portion.