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Simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a 3.5mm drill bit to get below 200bpm - C1 is too small for film; is film needed? Notes: Could make the walls; a little bit of margin } module make_surface(filename, h) { for (a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]) linear_extrude(height=a/h, convexity=10) projection(cut = true) surface(filename, center=true); } 3D Printing/Pot_Knobs/print_knob.stl Executable file View File WARNING: There is a little bit of margin $fn=FN; title_font = 10; knob_radius_bottom = 14; // [1:1:84] working_increment = working_height / 5; out_row_1 = v_margin+12; out_row_2 = out_working_increment*1 + out_row_1; out_row_3 = out_working_increment*2 + out_row_1; out_row_5 = out_working_increment*4 + out_row_1; out_row_7 = working_increment*6 + out_row_1.

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