can you post the Gcode (comments on, on the Printer // Firmware tab).
I don't have an idea jet, because I don't have that dent.
It's a normal cube that model, isn't it? Because the only thing I can think of is, when it last layer is a small area, and the minimum layer time on the material tab is set to high, so it's so slow printing the last area that the printed part melts because the extruder is a long time on almost the same place.
I have the end Gcode modified though: I have inserted a line to keep the HPB and extruder warm for 10 minutes, but that can't be it.
Your end Gcode is like this:?
G1 X80 Y50 Z155 F900 (so, normally, direct after the print the extruder goes to this place)
M18 A B(Turn off A and B Steppers)
M18 X Y Z(Turn off steppers after a build)
M72 P1 ( Play Ta-Da song )
G4 P600000 (keep warm for 10 minutes after a print)
M70 P5 (We <3 Making Things!)
M72 P1 ( Play Ta-Da song )
M73 P100 (end build progress )
M137 (build end notification)