message: pass dxf options
diff: try {
  switch (request.format) {
  case MakerJsPlaygroundExport.ExportFormat.Dxf:
  - text = makerjs.exporter.toDXF(processed.model);
  + text = makerjs.exporter.toDXF(processed.model, request.options);
  break;
  case MakerJsPlaygroundExport.ExportFormat.Json:
  