When FreeCAD was taking too much time to load DXF files for use with SendCutSend.com I loaded up LibraCAD and it’s been working well. I don’t know about the 1:1 printing but often I find PDF is a good way to get 1:1. LibreCAD is 100% free and open source and is built on Qt so is also cross platform.
Yeah, LibreCAD is a fork from qcad that isn’t “open core” and it’s what I personally use. But I had thought that Windows support was better in qcad. Maybe I’m wrong about that; I rarely touch Windows.