I have managed to make a rectangle. The problem was that I tried to make a small rectangle in a scale in Dynamo set to “Extra Large”. Now I set it to medium and it’s working.
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Sadly, I get exaclty the same error
"IG_CURVE_BS3_COI_VERTS – Curve or its approximation have coincident control points” also with solid.byloft…
but the jagged edges of the curve have disappeared since I changed the scale from extra large back to medium