This extension extends the existing 'Extensions>Render>Gear>Gear' and renders a pair of gears based on the settings selected. This is aimed to help render pairs of gears which will be laser-cut. The extension can render gear pairs based on the distance between the shaft centers (D), or a fixed circular pitch (CP) for a fixed number of teeth on each gear. It can also render a gear pair using a combination of D, CP and gear ratio (GR) to generate a 'best-fit' tooth count. The modified parameter is added as text for future reference.