After quite a bit looking on the Internet and in various forums for a post processor for Mach3 for FeatureCAM I found nothing,
so I brewed my own one that works quite well including subroutine calls and nice typing.
Hope it helps someone out there :-)
Update: Just put the "new" version up, some corrections...
Also, if you use macros, you'll have to put them all at the end of the file if you want to use it in Mach3... Quite easy to do: all sections beginning with an O# (where # is a number) and ending with an M99 you cut and paste at the very end of the file (after the M2 of the proper program).
Quite easy to do, but haven't figured out how to implement it in the Featurecam post, yet.
For any problems please feel free to write back :-)
Best
Pierre