Nozzle Stuck in Hollow Print

I'm pondering something. I attempted to print this hollow snowman on my Gmax 1.5 xt + with a 0.4 E3D volcano. The nozzle on my gmax ended up getting stuck inside the hollow part of the snowman and having a thermal underrun. My question is how do I avoid having my nozzle get stuck inside of a large print? The only thing that came to mind was re-level my X carriage. Other then that I'm not sure but I imagine something else has to play into this happening. Also I just installed Cura 3.6 and its not heating my nozzle instead cooling down any ideas? Thanks.
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