<p>I build and export my model using ZBrush and as STL files.<br />
To fix the mesh for 3D print, I try to use 3D Builder which can automatically repair my parts.<br />
As it saves as a single file, if I import all parts at once,<br />
I import the files one by one, repair them, then save them as a new file.<br />
After all the parts were repaired, I import all parts to see the result<br />
but find some repaired parts' positions shifted.<br />
How should I handle these issues?</p>
<p><a href="https://i.stack.imgur.com/01xRd.png" rel="nofollow noreferrer" title="Rendering of 3D model with parts shifted from original position"><img src="https://i.stack.imgur.com/01xRd.png" alt="Rendering of 3D model with parts shifted from original position" title="Rendering of 3D model with parts shifted from original position" /></a></p>

[{'answer_id': 19323, 'author': 'Kilisi', 'author_id': 31811, 'author_profile': 'https://3dprinting.stackexchange.com/users/31811', 'pm_score': 1, 'selected': False, 'text': "<p>It has moved it to the ground as close as it could. This is generally best for 3d printing seperate objects.</p>\n<p>If you need them together you can reposition them, or combine them.</p>\n<p>Alternatively change the 'Collision' and 'Intersect' settings until you get what you want.</p>\n"}, {'answer_id': 19335, 'author': 'Trish', 'author_id': 8884, 'author_profile': 'https://3dprinting.stackexchange.com/users/8884', 'pm_score': 3, 'selected': True, 'text': '<p>STL models as exported by software often include their origin in the origin of the design software. However, when using software to fix modeling errors, those origins are not always retained and thus when importing them into a different software their <em>center of mass</em> is taken as the new point of reference.</p>\n<p>Slicers are notorious in that they ignore the included origin. Even <em>if</em> models contain an origin that would, when imported into 3D design environments result in the items lining up correctly, the slicing software will simply not care and take a <em>lowest point in the projected center of the object</em> as the coordinate for the item, as this is what is relevant for positioning in the software.</p>\n<p>To mitigate that problem, it is best to export models that need to be <em>joined</em> after processing a boolean union on them.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/19320', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/34011/']