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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.

defect

Here you can see the front of the boat already arching up:

defect 2

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 1

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. <a href=enter image description here">

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!