Printed without supports, with the camlock-side down on the printing place. Picture is with PLA, 25% infill and used it for 2 hours with great success to sand overhead beams.
The author remixed this model.
Adjusted the outside diameter of the attachment to be 2 inches (53mm), so it fits securely inside 2 inch vacuum or dust collector hose. This is the same hose that fits in the back of my Dewalt tablesaw, so it's a versatile fitment.