Hi Michael, i often fix artwork coming from other clients, many are sign makers themselves. Usually if a letter changes a fill colour at a click inside a drawing package then you can assume the shape is closed and done ok. That was my 1st test,pass. However, i then noticed the chamfer not looking right I fixed all those imported back to moi and same issue. This is about importing files originating elsewhere.. I wanted a real test..fresh artwork...all dxf exports from coreldraw made with native font text converted to curves and therefore a closed vector curve. These all had same issues, might indicate the dxf is importing not quite right or points are not interpreted correctly on import. When doing extrude with these (as per Charlies original) it would create a square panel behind the shape. My polyarc dxf tool worked but unfortunately it did not give a smooth letter rim.

I originally requested the dxf file from Charlie as to me the chamfer control points did not look correct. A normal chamfer should have two nodes before the chamfer - not one at/on the point. Maybe to fully solve the issue is not just about looking at the origination, also what's going on with other dxf imports. Can post some files later...