Looking at the infill pattern visible through the tears in the top layer, it looks as if you have unreliable extrusion on the infill layers also.
The solid fill layer is lifted and torn, so it is unlikely that one or two more layers of solid fill will make the result better. In my experience, bumps lead to taller bumps and print failure.
theseThese diagnostic steps have helped me:
Print a 3 layer solid fill version, the top surface should be smooth and free of bumps.
Print a single layer version, it should be smooth, well attached to the print bed, of even thickness, and a good surface for the next layer.
Print a 3 layer solid fill version, the top surface should be smooth and free of bumps;
Print a single layer version, it should be smooth, well attached to the print bed, of even thickness, and a good surface for the next layer.
Given your results, I am suspicious that you may have one of these problems, which I've listed in the order of likelihood:
partiallyPartially blocked nozzle
excessiveExcessive drag from the filament supply, such as a spool with crossed filament which jams itself, preventing unwrappingunwrapping;
extruderExtruder feed roller slipping (perhaps full of dust), often a side effect of 1 and 22;
gG-code error dropping the temperaturetemperature;
badBad heater or thermistor, perhaps intermittent short of the thermistor, causing under heating even though the "average" indicated temperature is correct.
Printing gliders is a cool application. It shows off the weight advantage extrusion 3-D printing can deliver. Nice.
