I have a stock rotary tool that came with my ShapeOko 2 You can pull the bent tube down to change bits etc. Still a work in progress, I think Ill need to make the pipe come down further or be able to slip up and down depending on your cutting depth. UPDATE: Bigger tube size in the bend to account for different type rotary tool and its nut. Also lengthened the down pipe but still need better method for getting as close to the cut/dust as possible.