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Top surface, or not. // Scale factor for the articles! // smoothing = true; arrow_scale_shaft = 1.5; // // directional indicators // // Physical attributes, basic // you won't need to mess with them. Cylinder(r1=knob_radius_bottom,r2=knob_radius_top,h=knob_height, $fn=knob_smoothness); smoothing(); } external_direction_indicator(); } shaft_hole(); } set_screw_hole(); } arrow_indicator(); indentations(); } } // Softer World (alt tags), Dinosaur Comics (alt tags+blog), CAD, attempt at OOTS (but that one uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and.

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