Tracy as you have found not all DXF files (and other vector files) are good ones. Some won't open at all and others are missing vectors, still others have all the vectors but they are all broken up into small pieces. You never know what you are going to get when you down load them. Some times you download the file and find that it will not cut correctly so it won't fit together, then you have to modify everything and hope you did not miss something.
I usually start with the idea and just draw my own vectors and make what changes I want to to the original idea. This way it is your own and you control what fits where and can design for the material you want to use.
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