Thanks Neale saves me a job. Out of ideas then.
Printable View
Same here. All toolpaths look OK in CamBam and Mach3. I'd suggest is that you set your target depth to -3 rather than 3. but CamBam corrects this anyway. About to make a comment about the cut width then realized Clive has already done so.
Something is wrong with your mach3 not the g-code. I have the mach3 demo installed for testing purposes without any settings altered. Your g-code shows up and runs perfectly.