You can try the tool hosted directly from github. There are example SVG files in example-svg/Entypo. A hole in an SVG path should be defined by points in counter-clockwise order, where the shape ...
While going through my twitter feed I came across a project that allowed users to upload SVG files, extrude them into 3D models using Three.js, and charged $5 for downloading the resulting GLTF file.
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