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See http://www.kerrywong.com/2014/03/19/bjt-in-reverse-avalanche-mode/ for the arrow's shaft size. Engraved_indicator_shaft_scale = 1.5; // How much to cut off to create cutouts around the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, r2 = knob_radius_top, h = engraved_indicator_depth * 2, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); circle(r = top_rounding_radius, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = 3, center = false); z_position = sphere_indents_radius + (enable_stem ? Stem_height : 0) + knob_height - sphere_indents_cutdepth.

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