Nah it's not melted, but more like it's been shaken apart, much like bending a wire back and forth until it brakes, but in many places. It's not downward force, more like the far end of the X axis arm has been pulled back and forward but not enough to break or bend anything.
I did have clear plastic sides loosely on to stop incoming cold air flow, but nothing on the top to lock in the heat. The extruder appears fine, although I haven't used it since the X-motor carriage crumbled. The belts were firm but with a bit of give, same as instructional video on tenstioning them. While trying to work out why the prints kept randomly skipping forward or backward on the Y axis I tried both tightening and loosening them, but by then, it was too late, the solidoodle parts had already failed.
Looking at the failed X-motor carriage parts now, I can easily crush them and they are seperating back into individual strands of ABS/PLA. Similar to when you print a part and the extruder is too high so the layers don't stick together properly.