Parametric sprocket for various roller-chain or catepillar-track drive applications.Update: generated STL file for bicycle front sprocket with these parameters (measurements in inches): sprocket(34,0.312,0.5,0.12,0.001);You need OpenSCAD to use this file. OpenSCAD can be downloaded here: http://www.openscad.org/Include file in openscad and then call: sprocket(number_of_teeth,roller_diameter,pitch_length,thickness,tolerance);For instance code for sprocket block: sprocket(34,6,9,3,0.2); translate([0,0,6]){ sprocket(26,6,9,3,0.2); translate([0,0,6]){ sprocket(20,6,9,3,0.2); translate([0,0,6]){ sprocket(16,6,9,3,0.2); translate([0,0,6]){ sprocket(14,6,9,3,0.2); } } } }