Click to the Export button on the toolbar.

Enter the name of GDML file and select the path where you want to save the file.
When the conversion process is completed, a message will appear on the screen click OK to finish.

MRADSIM – Matter Radiation Interactions Simulator
INFN, IRADETS, MAPRAD
Click to the Export button on the toolbar.
Enter the name of GDML file and select the path where you want to save the file.
When the conversion process is completed, a message will appear on the screen click OK to finish.