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Summary This is always this part that breaks on a olfa knife. Print this stl, use a 1 inch 6-32 bolt and 2 nuts. one bolt is used to tighten the knob. You may have to cut the length of the bolt. Print 90 - 100 % filling, to make it very solid. Suggestion: print two or more at the time to allow time enough to pla to cool down.