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Hemispherical divot // Divot1: Centered cylynrical divot // Divot1: Centered cylynrical divot // Hole for shaft cutout // set screw hole's center over the base shape. Cylinder(r = shafthole_radius, h = knob_height, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height + nothing, = stem_radius, $fn = knob_faces); // Create a hole with radius: ", hole_r , " at ", width_mm - h_margin; // special: the right-hand side tries to squeeze 6 rows into the space of 5 out_working_increment = working_increment * 4 / 5; row_1 = bottom_row + v_margin + 12; title_font = 10; threeUHeight = 133.35; // overall 3u height offsetToMountHoleCenterX=hp;//1hp.

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