2D to 3D

[Mike Parykaza]

We use AUTOCAD LT to run a 2D laser cutter. We are investigating 3D software, and finding compatibility issues.
Typically we receive files from architects which have numerous drafting errors, wrong layers, etc. We need a program that will take information from our LT program, then create a "watertight" surface (mostly ground contour information) which can be read by a CNC or Rapid Prototyping machine.
We have seen demos by RP Magics and Delcam (Artcam, powermill), and were impressed by both of them.
Is anyone aware of 3d program "trial versions" that can import / export .DWG and .DXF files?

[karim]

you can use coreldraw to import and export dxf and dwg
i use autocad lt to make drawing and export plt file and import it in coreldrow
also you can make your design in corel and export it to dxf or any format you want to use in artcam or any software you need
for the 3d serface you can use 3dmax to make what you want and also
rhino3d
if you want any more info email me
my email: kimo3308@hotmail.com