Hi Boyan,
Thanks for the info, I agree Devcad is best software for foam cutting.
The reason I'm using Mach 3 because I can use the Mach 3 with my router as well.
Those dedicated software for foam cutting either Devcad or GMFC are better for foam but each of them require new USB controller + software all add up quite expensive for beginner.
Kind regards,
Boonie