Hi Max - My guess is that it is having trouble creating all the hatches - it does open, eventually, here - I’ll send you a 3dm in a moment. Do you get to the stage where the import dialog comes up? If so, set ‘boundary curves’ rather than ‘hatches’ - the solid hatches need to genertate meshes and on this convoluted object, that may be hard. Ramadan Pattern2Curves.3dm (4.5 MB)