<p>I am printing Eryone 1.75 mm PET on my Kobra Max printer with 80°C bed and 230°C.</p>
<p>I am experiencing this:</p>
<p><a href="https://i.stack.imgur.com/RXv0n.jpg" rel="nofollow noreferrer" title="Possible stringing and over-extrusion"><img src="https://i.stack.imgur.com/RXv0n.jpg" alt="Possible stringing and over-extrusion" title="Possible stringing and over-extrusion" /></a></p>
<p>Is this &quot;over-extrusion&quot; and &quot;stringing&quot;?</p>
<p>And how do I avoid this?</p>

[{'answer_id': 20009, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 0, 'selected': False, 'text': '<h1>Stringing</h1>\n<p>PETG is prone to stringing, even with the best settings. Often, I live with some stringing as strings are easy to clean up while other issues can be introduced by getting totally rid of it.</p>\n'}, {'answer_id': 20010, 'author': 'R.. GitHub STOP HELPING ICE', 'author_id': 11157, 'author_profile': 'https://3dprinting.stackexchange.com/users/11157', 'pm_score': 1, 'selected': False, 'text': "<p>PETG sticks to brass nozzles <em>really well</em>. Better than it sticks to itself, in many cases. When travelling over already-printed material, especially if the filament is not retracted (Cura calls this kind of travel &quot;combing&quot;) or if the material it's travelling over is overextruded and bulging up, the nozzle will pick-up/dig-up some of that material and drag it around. There, it accumulates until the size and shape is adequate to cause it to get dislodged when a part that's sticking out far enough not to be molten collides with another part of the print, and it falls off. It may get picked up again by the hot nozzle later, leading the process to repeat.</p>\n<p>There are various mitigations for this:</p>\n<ul>\n<li><p>Limit &quot;combing&quot;. In Cura, set &quot;Max Combing Distance Without Retract&quot; to 1 mm and &quot;Connect Infill Lines&quot; on to get good behavior without introducing huge numbers of retractions. slic3r-based slicers have an option called something like &quot;Only Retract When Crossing Perimeters&quot; that you want to turn <strong>off</strong> to get the same effect.</p>\n</li>\n<li><p>Make sure you're not overextruding. Turn down flow slightly if needed.</p>\n</li>\n<li><p>Dry your filament. PETG is always wet unless you dried it in the past 24 hours yourself, and wet PETG does this a lot worse.</p>\n</li>\n<li><p>You may be able to select a nozzle that the material doesn't stick to. There are non-stick (likely PTFE) coated nozzles designed for this purpose (but they can't be used at high temperatures), and nickel plated seems to do better too. I'm not sure about other materials like stainless steel or (note: expensive) tungsten carbide but they may be options to improve this too.</p>\n</li>\n</ul>\n"}]
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