Abstract: A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

Abstract: A blade attachment system includes a tool mount, a blade holder plate attached to the tool mount adapter; and a clamping assembly attached to the blade holder plate. The clamping assembly includes a plurality of fixed clamping positioned adjacent to at least one of the lateral edges of the blade when the blade is placed on the blade holder plate and including tapered surfaces configured to overlap the lateral edges of the blade and at least one movable clamping pin that is movably mounted to the blade holder plate, the movable clamping pin being configured to move with respect to the blade to move the lateral edges of the blade into engagement with the tapered surfaces of the clamping pins.

Abstract: A cooling device for an extruder of a three-dimensional (3D) printer includes a cooling fan, a supply duct, and a cooling duct. The cooling fan generates a fluid stream which is directed to the cooling duct through the supply duct. The cooling duct has an outlet portion that is ring shaped. The outlet portion has an inner wall and an outer wall, the inner wall having a plurality of outlet holes which evenly distribute the fluid stream in a 360-degree pattern around a print nozzle of the extruder to cool the print nozzle, deposited resin, and/or a print surface.

Abstract: A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.

Abstract: A blade attachment system includes a tool mount, a blade holder plate attached to the tool mount adapter; and a clamping assembly attached to the blade holder plate. The clamping assembly includes a plurality of fixed clamping positioned adjacent to at least one of the lateral edges of the blade when the blade is placed on the blade holder plate and including tapered surfaces configured to overlap the lateral edges of the blade and at least one movable clamping pin that is movably mounted to the blade holder plate, the movable clamping pin being configured to move with respect to the blade to move the lateral edges of the blade into engagement with the tapered surfaces of the clamping pins.

Abstract: A tool holding system for a rotary power tool is configured to clamp around a working tool when the working tool is inserted in the tool holding system. The tool holding system includes a sleeve having a frustroconical inner surface portion, a collet having frustoconical outer surface portion complementary to the inner surface portion, a spring mount operably connected to a motor for rotation by the motor, and a spring. The spring includes a first end portion operably connected to the collet to bias the collet toward a first position whereat the outer surface portion engages the inner surface portion, and a second end portion rotationally fixed with respect to the spring mount.