<p>When printing several objects, I recently encountered a problem that arises when the structure in itself is relatively thin or the support towers have a small surface: the printhead would in motion tend to knock one or more over as it traveled or catch at them and create layer shift.</p>

<p>How can I avoid collisions with the already printed parts of a layer?</p>

[{'answer_id': 7039, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 4, 'selected': True, 'text': "<p>The problem was twofold:</p>\n\n<ol>\n<li>Lack of bed adhesion due to the small contact surface</li>\n<li>motion into the already printed objects.</li>\n</ol>\n\n<p>The <em>quick and dirty</em> way was to change two settings:</p>\n\n<ul>\n<li>Print with a small (3\xa0mm) brim to stick the supports to the print and provide more surface. Other materials than PLA may need considerably more brim!</li>\n<li>Activate Z-Hop to force the nozzle to lift over the print when traveling</li>\n</ul>\n\n<p>These tricks don't solve issues with very thin structures or in all cases. In those cases, it can be mandatory to increase the structure's (support) thickness or change the alignment.</p>\n"}, {'answer_id': 10388, 'author': 'she hates me', 'author_id': 16714, 'author_profile': 'https://3dprinting.stackexchange.com/users/16714', 'pm_score': 2, 'selected': False, 'text': '<p>For the Creality Ender 3, I had the same collision problem and after a while I found it was because of the X-axis not being level.</p>\n\n<p>I found right hand side was more than 3-4 mm below the left side when the Z-axis height exceeds around 8-10&nbsp;cm. Below that, the two sides were even. I made some calibration by turning the eccentric nuts of the wheels and tighten them.</p>\n\n<p>If you use Creality Ender 3, that might be the problem. Take a ruler and check between base extrusions and X-axis left/right hand sides at different Z heights.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/7038', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/8884/']