@bitingmidge have you tried Vectornator? It’s only supported on Apple devices and it looks a lot more user friendly than Inkscape.
@azab2c Hmmm, 3MF files include a UV map so I wonder if it would be easiest to apply a brick texture to your 3D box. Scale/position as you like and export a 3MF file. Then rename the 3MF extension to ZIP in your OS and pull out the UV map image. You’ll have to still convert the raster image to vector but I think that would be a pretty easy method to generate a nice brick pattern.