[dv35z]

Check out Kiri:Moto (open source tool which can convert SVG into 3D shapes, and export to G-code appropriate for 3D printers, CNC routers)

https://grid.space/kiri/

[amelius]

Thanks, but Freecad can also do it. The point is that it is a lot of work to import, extrude, etc. I would prefer a commandline tool that takes the name of an SVG (or DXF) file, and outputs an STL file that I can directly send to my printer (slicer, actually).