How to convert stp file to 3dm or 3dmax

Can sombody please help me convert a .stp file to 3dm or 3dmax?
https://grabcad.com/library/convaluted-foam-24x24#_=_
this is the link for the model I really need it in 3d fill
thanks for the help!
Can sombody please help me convert a .stp file to 3dm or 3dmax?
https://grabcad.com/library/convaluted-foam-24x24#_=_
this is the link for the model I really need it in 3d fill
thanks for the help!
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