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The first print was .2mm layer height and 15% infill (like the instructions said) with raft. The knob just snapped off in my hand so on the second print I've bumped it up to 35% infill with the same problem. When I took both apart, the screw was fused in place at the jack connection end with the knob. Part seems to be the problem is the prism on the screw is fused to the joint, where in you picture it is not.