Hi,
You're right, the post processor will most likely require some modifications.
Basic 3-axis milling should work well, but there are aspects that need to be carefully checked (machine parameter settings vs. post processor, home positions, cooling, etc.) or additional optional features that might need to be added, such as a pallet changer or multi-axis kinematics.
You probably don’t have much experience with post processor modifications. If you’d like, feel free to send me a message, and I'll offer you my professional help.
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