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Sorry, no — i am still confused The solid core is as long as the hollow section. Am I supposed to drill out or cut out the portions that tube in the center? Is that shaft actually just a support added to allow for printing the part without support? I fail to see how I can slide a nut inside the hex area when there’s a tube that runs the full length of the knob down the center. The photos all show it as hollow, but the 3D model and printed knobs run from end to end.