<p>I am trying to import an STL file, I created in FreeCAD. It has a hole in the hull of the object and behind that hole there are two pins inside the object (see attached FreeCAD screenshot).</p>

<p>When I import the STL in Cura, there are no walls around the whole object where there is the hole in the hull (see attached Cura screenshots). However the wall and the hole are visible in light grey, Cura just doesn't print it.</p>

<p>Update:</p>

<p> I understand the problem. It's not a watertight solid. I found a way to import it somewhat fine using meshmixer to create a hollow with an offset which makes the outer Hull actually have a thickness to it. Now the problem is, that's not really what I want. The result in cura now can't be printed with infill since the actual inside of the model is only within the walls. Also cura sees both sides of the wall as outer Perimeter. I understand the problem but actually am looking for a way to just prevent printing part of the regular model's wall.. In other words: I would basically like to set the whall line count to zero in that particular area. I just tried to use the support blocker and "Modify settings for overlap" but that doesn't do anything.</p>

<p>CURA:</p>

<p><a href="https://i.stack.imgur.com/hrCAY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hrCAY.png" alt="enter image description here"></a>
 <a href="https://i.stack.imgur.com/7ETuW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7ETuW.png" alt="enter image description here"></a></p>

<p>FreeCAD:
<a href="https://i.stack.imgur.com/Lddxh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lddxh.png" alt="enter image description here"></a></p>

[{'answer_id': 13272, 'author': 'R.. GitHub STOP HELPING ICE', 'author_id': 11157, 'author_profile': 'https://3dprinting.stackexchange.com/users/11157', 'pm_score': 2, 'selected': False, 'text': "<p>This is clearly overextrusion relative to the volume the material is being deposited into, but that doesn't necessarily mean your extrusion rate is wrong. It could be:</p>\n\n<ul>\n<li>Nozzle smashed down into the bed (bed way too high) but somehow still extruding</li>\n<li>Problem in Z axis movement preventing the head from moving up the right amount for each layer (possibly not moving up at all?)</li>\n<li>Extrusion (flow) increased significantly above 100% in slicer</li>\n<li>Wrong extruder steps/mm setting (usually controlled on printer not slicer, though you can send a setting in the start gcode)</li>\n<li>Misconfigued filament diameter (unlikely since there's no common setting smaller than 1.75 mm; larger setting would under-extrude)</li>\n</ul>\n"}, {'answer_id': 13292, 'author': 'Migster', 'author_id': 12721, 'author_profile': 'https://3dprinting.stackexchange.com/users/12721', 'pm_score': 2, 'selected': False, 'text': '<p>I\'d add to <a href="https://3dprinting.stackexchange.com/a/13272">R..\'s answer</a>: It could be:</p>\n<ul>\n<li>temperature is too high - which would cause the melted filament to flow a bit freely</li>\n</ul>\n'}, {'answer_id': 14093, 'author': 'Mike', 'author_id': 21916, 'author_profile': 'https://3dprinting.stackexchange.com/users/21916', 'pm_score': 0, 'selected': False, 'text': '<p>Bad filament is my answer. I bought PRLine and both print terrible like your picture. Suspect 2 factors, one is that the line is less than 1.75, so they underextrude and so you see those lines and in some cases gaps, second is the material itself is slippery suggesting to me that it has florinated additives.</p>\n'}, {'answer_id': 15126, 'author': 'agarza', 'author_id': 23193, 'author_profile': 'https://3dprinting.stackexchange.com/users/23193', 'pm_score': 0, 'selected': False, 'text': '<p>I just recently got my first 3D printer (Ender 3 v2) and am also using the Eryone PLA filament. After the first week, I was having bed adhesion problems as well. I think part of the problem is the bedsprings become loose rather quickly.</p>\n<p>Here is my current solution, leveling the bed with a receipt paper (thinner than regular 20lb bond paper) and using blue painter\'s tape on the stock glass bed.</p>\n<p>Since using this setup, I have not had any major issues with my prints. I have ordered new bedsprings (<a href="https://rads.stackoverflow.com/amzn/click/com/B07FY47BX7" rel="nofollow noreferrer" rel="nofollow noreferrer">Ogrimmar Yellow Springs</a>) and hope these will be a more lasting solution to the loose bedsprings.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/13271', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/18536/']