<p>Printer: SecKit Go w/ BMG/v6 and SKR v1.3/TMC2130 Drivers</p>

<p>Slicer: Simplify3d or Cura (problem is much worse in Cura?)</p>

<p>Long story short - after getting this printer running, I have noticed that it will underextrude ONLY on corners on an internal perimeter specifically once we're above bottom layers - and nowhere else. See below:</p>

<p><a href="https://i.stack.imgur.com/J9Y3r.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/J9Y3r.jpg" alt="enter image description here"></a></p>

<p>E-Steps have been calibrated, extrusion multiplier has been calibrated (single perimeters are 0.48&nbsp;mm), linear advance has been calibrated, but here it gets weird. Anything resembling a 'standard' value (suggested between 1-2) results in MASSIVE underextrusion after the speed change. I was able to get a good looking line using the linear advance test with a value of 0.15 (which seems very low).</p>

<p><a href="https://i.stack.imgur.com/VvSl7.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VvSl7.jpg" alt="enter image description here"></a></p>

<p>Retraction (1&nbsp;mm @ 30&nbsp;mm/s), junction deviation (0.02) and all other settings are off the factory Simplify3d profile. Turning linear advance off makes the problem slightly better but doesn't fix it, going to a value of around 1 results in huge underextrusion after any change in direction.</p>

<p>I am absolutely lost as to what to try next.</p>

[{'answer_id': 13881, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 2, 'selected': False, 'text': "<p>Unsupported parts need to be printed with support. If your supports are too hard to remove, try the Tree Support setting and make sure that your support structure is set up with a gap to the actual print. As we don't know which slier you use, I can't go into more details here.</p>\n"}, {'answer_id': 14101, 'author': 'povk', 'author_id': 21934, 'author_profile': 'https://3dprinting.stackexchange.com/users/21934', 'pm_score': 1, 'selected': False, 'text': '<p>You could try printing slower and/or increase cooling ( possibly even a cooler bed temp) if you absolutely want to avoid supports, or just use supports with a support interface and tweak support distance.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/12122', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/20282/']