I am attempting to print the Benchy boat but every attempt so far has been unsuccessful. The print has a sort of slope/blob on the nose of the boat, which emerges after the first 30 layers.
Here you can see the front of the boat already arching up:
I have tried decreasing speed to 40 mm/s but the issue remains.
Printer: Geetech Prusa I3 Pro B
XY Accelleration: 1000 mm/s2
XY Jerk: 20 mm/s
Retraction Accelleration: 2000 mm/s2
Extruder Jerk: 5 mm/s
Printing Speed: 50 mm/s
Travel Speed: 120 mm/s
Layer Height: 0.1 mm
Infill: 60% (Lines)
Material: PLA, 200 °C, 1.75mm filament, retraction enabled.
1 Answer
The lines along the length of the boat also appear to be wobbling, can you confirm this? Have you used this material before? The layers should look straight and equal. 
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I have 2 candidates: If the lines indeed wobble it may be over extrusion. The excess material pushing the extruded line over the edge. (check the diameter of the filament with a caliper and adjust the extrusion rate if needed)
Or it can be shrinking. 60% infill is quite high. You could try 20 or 30% (less material and more air => less distortion), or adjusting cooling.
Hope it helps, good luck!