This problem came through the forum in the last week. This issue is probably related to the changes Fusion 360 has made recently to the software for their personal license users. It is unclear if the bug is in Fusion 360 or guffy’s post processor. Other post processors have also been having problems after the Fusion 360 changes. Editing your gcode file and adding a M203 code for the Z axis was suggested as a short term solution. Here is a link to the previous posts on this issue: Problem with Fusion and Z feedrate
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