A openscad parametric rotary encoder. It features two options to drive this encoder. First option is over the shaft. Second options is to use the encoder as a wheel. If you change the wheelGrooveDepth parameter, a rubber O-Ring can be put on to the encoder. Openscad file "encoderWheelMK1Oring.scad" is a example configuration for use with a O-Ring. Changeable parameters, with default values: shaftDiameter = 3.30; wheelDiameter = 28; shaftMargin = 2.5; shaftHeight = 5; shaftBevel = 0.3; wheelHeigh = 0.75; wheelGrooveDepth = 0.0; encoderInnerRadius = 9.5; encoderOuterRadius = 13; encoderSlitWidth = 0.8; encoderSlitMargin = 0.8; encoderSlitCount = 35;