Hmm, unlike "5 axis", it doesn't say that "4 axis" is part of the extension, it specifically says "Rotary", which seems to be this: https://help.autodesk.com/vi

Hmm, unlike "5 axis", it doesn't say that "4 axis" is part of the extension, it specifically says "Rotary", which seems to be this: https://help.autodesk.com/view/fusion360/ENU/?guid=MFG-MULTI-AXIS-ROTARY https://help.autodesk.com/view/fusion360/ENU/?guid=MFG-MULTI... On the "4th axis wrap toolpath" page, it doesn't have the same "this is part of an extension" warning: https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-7FF25192-AED7-4230-92DC-E22ADF15D498 https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-7FF2... So I think (hope) that some forms of 4-axis machining are still free.