GCODE danger

Just got slic3r producing gcode that the Cetus 3D will print. My objective was to be able to produce a seamless vase. To begin with things looked good. The raft printed OK. The 8 layers of base looked good, and when the extruder started making the circles I thought I saw it proceed vertically. When I looked back a moment later I saw the cantilever arm moving back and forth with the platter movement. I stopped that right quick.

If I hadn’t been printing a tiny test piece I might have done serious damage.

What happened was that the Z movement stopped when the tiny vertical steps started, but the extruder didnt. The ring of PLA just built up to where the nozzle was jamming up into the PLA.