This is my annual warning that AutoDesk isn't The Benevolent Software
Company, and they aren't in business to give you free stuff because
you're so awesome.  AutoDesk has a history of offering free or low cost
software to entice users into investing their time to learn the software
(this may be the highest cost of ownership), and once you have tens or
hundreds of designs in their proprietary CAD format, they decide to
unilaterally change the deal and you're trapped.  They did this to me
with AutoSketch, a couple of decades ago.  I had hundreds of hours
wasted and many designs were abandoned because I couldn't export them. 
AutoSketch was never a serious product.  It was used to migrate users to
AutoCAD LT, and then to AutoCAD.

FreeCAD doesn't do everything you might want, but I've been very happy
with it and I'm grateful to the open source programmers who make it
possible.  If all you want is 2D or 2.5D CAM for LinuxCNC, it may be all
you need in its current state.  FreeCAD is still under development, so
it may have the features you need by the time you need them, but that's
a risky proposition with free open source software.

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