Workflow: DXF to 3D print

Open DXF in Illustrator
If there are double lines it might be caused by infill and contour lines overlapping. Ask the maker of the DXF file to give the infill a different color than the outline.
- In illustrator, select an infill or outline object
- Select > Same > Fill & Stroke
- Delete
- Check for errors in outline mode (cmd+Y)
Select a shape
Put it in a new document (copy, make a new document, paste)
File > Export > Export As > Format: DXF
- Scale: 1 CM is 1 unit (remember this for later)
In Fusion 360: Insert > Insert DXF
- Check that units are set to CM (the same unit as the Illustrator export)
Select the shape, extrude
CMD + click the object in the tree > Save As Mesh > OBJ
- Unit type: Millimeter
Import the OBJ file into Cura and check the dimensions. Now it's ready to print