<p>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.</p>

<p><a href="https://i.stack.imgur.com/vx2cM.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vx2cM.jpg" alt="defect"></a></p>

<p>Here you can see the front of the boat already arching up:</p>

<p><a href="https://i.stack.imgur.com/q9Z6A.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/q9Z6A.jpg" alt="defect 2"></a></p>

<p>I have tried decreasing speed to 40 mm/s but the issue remains.</p>

<p><strong>Printer</strong>: Geetech Prusa I3 Pro B</p>

<p>XY Accelleration: 1000 mm/s<sup>2</sup></p>

<p>XY Jerk: 20 mm/s</p>

<p>Retraction Accelleration: 2000 mm/s<sup>2</sup></p>

<p>Extruder Jerk: 5 mm/s</p>

<p>Printing Speed: 50 mm/s</p>

<p>Travel Speed: 120 mm/s</p>

<p>Layer Height: 0.1 mm</p>

<p>Infill: 60% (Lines)</p>

<p>Material: PLA, 200 °C, 1.75mm filament, retraction enabled.</p>

[{'answer_id': 5650, 'author': 'Smitje', 'author_id': 4406, 'author_profile': 'https://3dprinting.stackexchange.com/users/4406', 'pm_score': 0, 'selected': False, 'text': '<p>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.\n<a href="https://i.stack.imgur.com/PvV5g.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PvV5g.png" alt="enter image description here"></a></p>\n\n<p>I have 2 candidates:\nIf 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)</p>\n\n<p>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.</p>\n\n<p>Hope it helps, good luck!  </p>\n'}, {'answer_id': 5671, 'author': 'Killingyou1026', 'author_id': 10273, 'author_profile': 'https://3dprinting.stackexchange.com/users/10273', 'pm_score': 2, 'selected': False, 'text': '<p>Looks like curling from to much being extruded and no cooling I had the same problem added part cooling and problem was gone </p>\n'}]
['https://3dprinting.stackexchange.com/questions/5645', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/10229/']