https://community.graphisoft.com/t5/Collaboration-with-other/IFC-Export-to-Revit-IfcPolyLine-1063146-is-too-short-discarding/m-p/264740#M34596 That's a Revit limitation, not ARCHICAD. It may happen when you have smaller items, which are meshed (triangulated) upon export and end up as small triangles. Anything below a certain size is discarded by Revit.<BR /> <BR /> Typical situations are inside the turns of a stair or within library objects with smaller details. Mon, 21 Oct 2019 06:41:30 GMT stefan 2019-10-21T06:41:30Z https://community.graphisoft.com/t5/Collaboration-with-other/IFC-Export-to-Revit-IfcPolyLine-1063146-is-too-short-discarding/m-p/264739#M34595 <DIV class="actalk-migrated-content"><T>Any idea how I can track this one down?;)</T></DIV> Fri, 18 Oct 2019 21:26:44 GMT https://community.graphisoft.com/t5/Collaboration-with-other/IFC-Export-to-Revit-IfcPolyLine-1063146-is-too-short-discarding/m-p/264739#M34595 Anonymous 2019-10-18T21:26:44Z https://community.graphisoft.com/t5/Collaboration-with-other/IFC-Export-to-Revit-IfcPolyLine-1063146-is-too-short-discarding/m-p/264740#M34596 That's a Revit limitation, not ARCHICAD. It may happen when you have smaller items, which are meshed (triangulated) upon export and end up as small triangles. Anything below a certain size is discarded by Revit.<BR /> <BR /> Typical situations are inside the turns of a stair or within library objects with smaller details. Mon, 21 Oct 2019 06:41:30 GMT https://community.graphisoft.com/t5/Collaboration-with-other/IFC-Export-to-Revit-IfcPolyLine-1063146-is-too-short-discarding/m-p/264740#M34596 stefan 2019-10-21T06:41:30Z