MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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hahaaa .... thx for your promt help, i dont know what i am exactly doing , but i have already the machmixer program, i checkt for error nothing found, then i played around with the thickness you said , then i make a new .stl file and it works .... thanks very much, and thanx for the nice present i have yet for may sister !!!!