I have been designing a 3-axis 2.5D mill for some time now and the software has been troubling me quite a bit. The conversion from turbocad's (v7 or v12) .dxf and sometimes .plt files formats are not accepted by mach 3 - the g-code will only will be bout 10 lines long.
Also 3d plt drawings will transfer into mach 3 only as flat drawings, this is similar to what a friend is expirenceing.
Dan