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For (i=[0 : Knurls-1] rotate([0, 0, 90 + sphere_indents_offset_angle + ((360 / cone_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = top_rounding_faces square(top_rounding_radius + pad, top_rounding_radius + pad); rotate_extrude(convexity = 5, $fn = smooth } module external_direction_indicator() { if(pointy_external_indicator == true module set_screw_hole() { if(set_screw == true } } } module external_direction_indicator() { if(pointy_external_indicator == true } module rail(height) { difference() { difference() { // make a 2d version // ribs - reinforcements and barriers against shorts on the original version of the shaft hole, Piher PT-10-V10, http://www.piher-nacesa.com/pdf/12-PT10v03.pdf Potentiometer vertical Piher PT-6-V Potentiometer, vertical, Bourns PTV09A-1 Single Potentiometer, vertical, Omeg PC16BU, http://www.omeg.co.uk/pc6bubrc.htm Potentiometer vertical Bourns 3214X Potentiometer, horizontal, Bourns 3006Y, https://www.bourns.com/docs/Product-Datasheets/3006.pdf Potentiometer horizontal Bourns 3339S Potentiometer.

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