Egg shape gear set. Parts are designed for 3d printing. Suggesting using resin material when printing. Size is 60X35mm. Files: https://www.cgtrader.com/3d-print-models/gadgets/other/3d-ellipse-gear-t18m2-60x35 You can download the free 3D PDF file here: https://www.tanerxun.com/simple-bevel-gear-examples/.html
