Frage MeshCam & UCCNC & stepcraft2 600

Hello
i am using a design spark mechanical and meshcam and stepcraft 2 600 .
My question is what file type should i be saving my files in as there is a whole list of them and stepcraft is not on the list

some thing is not working between UCCNC and MeshCam ,the first pass is good. But the 2nd pass goes wrong.
It's supposed to do 1.5mm Every pass BUT on the second pass it Want to DIG A Hole and break my mill bit

For further investigations you can download the NC-Correcor:

Simulation and simulate it.

Then you know that your G-code is ok.

It must be all to do with the post processor

What do you all think or is it the Machine causing problems

Z axis stalling on retract possibly - check Z axis. Mechanical tuning