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Vertical_space/7; row_7 = row_6 + vertical_space/7; row_3 = working_increment*2 + row_1; //special-case the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = shafthole_faces); // Adapt to a D-shaped shafthole cross-section. 0 to keep it round.

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