<p>While printing a <a href="https://www.thingiverse.com/thing:3932302" rel="nofollow noreferrer">paint rack from thingiverse</a> I keep getting jams. Other prints (shorter) work fine. Can anyone give me a clue?</p>
<p>Here's a <a href="https://photos.app.goo.gl/PQuJwqNdYWSMTiwm6" rel="nofollow noreferrer">video of the printer</a></p>
<p>I thought it was heat creep so I increased the speed and decreased the hot end temperature. It generally prints for several hours then jams.</p>

[{'answer_id': 15352, 'author': 'cmm', 'author_id': 2082, 'author_profile': 'https://3dprinting.stackexchange.com/users/2082', 'pm_score': 1, 'selected': False, 'text': "<p>When I started printing ABS with my Prusa i3 MK3 MMU2+ printer, I started experiencing jams on some longer prints, which was heat creap, possibly combined with old filament.</p>\n<p>I improved the cooling by filling the gap between the sides of the heat sink and the plastic extruder body. I think I stuffed it with some soft foam rubber, but anything that can handle the (what should be fairly cool) temperature should work.</p>\n<p>My hypothesis is that with gap allowed too much of the air to pass without engaging the heat sink, compromising the cooling.</p>\n<p>With that change, I haven't had heat-creap jams.</p>\n<p>You aren't printing ABS, but the temperature is high, and PLA softens as a low temperature. IMO, it would still be worth making the change.</p>\n<p>It is the gap on the front and rear sides that I blocked.  The heatsink fins are fully open for air flow.</p>\n<p>Some people here have changed out the Noctua fan for one that is noisier and pushes more air, which should also work. I appreciate the quiet fan, so I tried to get more work out of the fan I had.</p>\n"}, {'answer_id': 15355, 'author': 'Jay', 'author_id': 5369, 'author_profile': 'https://3dprinting.stackexchange.com/users/5369', 'pm_score': 0, 'selected': False, 'text': '<p>The maker geeks formulation of PLA requires much hotter temperatures. The plastic was not melted enough for good flow.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/15066', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/5369/']