<p>I have recently started printing with Polymaker's PolyMax PETG on my Ender 3 v2. I have not been able to get the layer adhesion anywhere near as strong as it should be. I would guess it is around 20-25 % of the strength in the XY direction. The parts snap easily along the layer lines under loads that PLA and nylon hold up to just fine.</p>
<p>Print settings:</p>
<ul>
<li>0.15 mm layers @ 35-20 mm/s</li>
<li>Hotend temp 245 °C</li>
<li>4 mm retraction @ 40 mm/s</li>
<li>combing on</li>
<li>jerk control on</li>
<li>no cooling</li>
</ul>
<p>I made sure to use a nickel-plated brass 0.4 mm nozzle. I have calibrated my E-steps and tried printing in an enclosure, but nothing seems to help with layer adhesion. I have made sure there is no debris getting on the filament as it comes out of the drybox and even tried taping around the heater block so there is absolutely no part cooling.</p>
<p>Any ideas as to what I could be doing wrong?</p>

[{'answer_id': 16513, 'author': 'R.. GitHub STOP HELPING ICE', 'author_id': 11157, 'author_profile': 'https://3dprinting.stackexchange.com/users/11157', 'pm_score': 2, 'selected': False, 'text': '<p>I had this problem with my Ender 3 until I changed to a different extruder and now PETG never has adhesion problems. Even 100\xa0% fan is fine at 245\xa0°C. I think the stock hobbed gear just slips on PETG really badly, giving underextrusion. Go slow, increase the flow to compensate, and possibly increase temperature slightly more. Or buy a decent extruder.</p>\n'}, {'answer_id': 16679, 'author': 'TreeBarkEater', 'author_id': 28896, 'author_profile': 'https://3dprinting.stackexchange.com/users/28896', 'pm_score': 2, 'selected': True, 'text': "<p>I got a roll of Hatchbox PETG and the prints are fantastic. Small test prints don't break along the layers even at higher fan speeds. The problem was the Polymax PETG. I took a look at the TDS for it and the impact strength on standing samples was only 29% of the standing ones. I believe the Polymax PETG just has inherent layer adhesion problems.</p>\n<hr />\n<p><em>Please note that Polymax PETG isn't PETG, it's PCTG. I may try doing some firmware changes and printing it at 270\xa0°C later on.</em></p>\n"}, {'answer_id': 16746, 'author': 'TreeBarkEater', 'author_id': 28896, 'author_profile': 'https://3dprinting.stackexchange.com/users/28896', 'pm_score': 0, 'selected': False, 'text': "<p>The layer adhesion with Polymax PETG at 260\xa0°C was great so I didn't go any higher.</p>\n"}]
['https://3dprinting.stackexchange.com/questions/16511', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/28896/']