Save part to load into mach3 cnc

Hi, i have drawn a part and saved as a part document. I want to load the file to mach3 cnc. I've tried saving as dxf but when I do that the part does not come up in the display but the file name does.  I try to load the dxf in mach3 that I saved but nothing happens. I feel like have tried everything. Can anyone give clear step by step to help me please.