<p>When I design parts that must fit in each other, I usually keep in mind that prints are 0.2-0.5 mm wider than expected (depending on material) and I size the parts accordingly.</p>

<p>However, sometimes I design the whole part and then I slice it with planes or lines. In these cases I need to push/pull afterwards each contact surface manually by the same amount (0.2-0.5 mm) and that is a time consuming task. Another option is to use a cutter to remove the outer surface layer (basically I remove the rigged surface, making it smooth again) but it's not safe and even more time consuming.</p>

<p>How can I quickly generate said controlled gaps on the contact surfaces between two objects, but not on the rest of the object? to make it everywhere I could use shells, I guess, but I don't need that on the whole object.</p>

[{'answer_id': 3717, 'author': 'Alucard Pawpad', 'author_id': 6370, 'author_profile': 'https://3dprinting.stackexchange.com/users/6370', 'pm_score': 3, 'selected': True, 'text': "<p>Unfortunately, 123D Design doesn't have such a feature.</p>\n\n<p>You could select multiple surfaces and push/pull them all at the same time though.</p>\n\n<p>Remember, your 3D Printer's slicer should have an option to undersize or oversize holes and walls, to help reduce/remove the effect you talk about. \nIt's called size correction, I think? Simplify3D Has it, atleast. \nYou might have to tweak this for every filament type, though.</p>\n"}, {'answer_id': 16598, 'author': 'Gabriel Grant', 'author_id': 29031, 'author_profile': 'https://3dprinting.stackexchange.com/users/29031', 'pm_score': 0, 'selected': False, 'text': '<p>AFAICT Push/Pull faces is the closest thing to what you\'re looking for. eg: <div class="youtube-embed"><div>\r\n                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/oSkTxuCRLMg?start=38"></iframe>\r\n            </div></div></p>\n<p>In OnShape there is an &quot;offset face&quot; command that allows applying such an offset to multiple faces at once: <a href="https://3dprinting.stackexchange.com/questions/16596/how-to-add-tolerances-gaps-in-onshape/16597#16597">How to add tolerances/gaps in OnShape?</a></p>\n<p>Unfortunately I\'m not aware of a way to do exactly the same thing in 123D Design, but I\'m far less proficient with that tool (as Alucard Pawpad <a href="https://3dprinting.stackexchange.com/a/3717/29031">noted</a>, though, it is possible to just select multiple faces at the same time and manipulate them all together, which is somewhat similar)</p>\n'}]
['https://3dprinting.stackexchange.com/questions/2970', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/2338/']