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See knob_base(). Cylinder(h = stem_transition_height, r1 = stem_radius, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height + nothing, = stem_radius, $fn = sphere_indents_faces); height = 128.5; // A little less then 3U // Thickness of module (HP) width = 24; // [1:1:84] working_increment = working_height / (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = thickness * 1.2; right_rib_x = width_mm - h_margin; col_left = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth.

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