I have Mac Pro turbo cad and I have dxf files for cutting wood to make wood Cnc clocks I bought a 3D printer imported the file to turbo cad and all I need to do is extrude to a width of 4mm or z to 4mm. There is ten files or clock gears some will extrude others will not. I believe that the gear points are not connected to be a one piece gear to extrude. I am lost. When you zoom in you can see the construction points where he designed the gears. Any ideas.