<p>How safe do you think it is to run an SLA 3D printer in the bedroom? I am planning to run Mi Air Purifier 3H/C while the printer is running, I am also thinking about adding <a href="https://rads.stackoverflow.com/amzn/click/com/B086277CNQ" rel="nofollow noreferrer" rel="nofollow noreferrer">this</a> inside the actual printer (Elegoo Mini Air Purifier with carbon filter).</p>
<p>Is this safe or still too risky?</p>

[{'answer_id': 18083, 'author': 'Kezat', 'author_id': 30645, 'author_profile': 'https://3dprinting.stackexchange.com/users/30645', 'pm_score': 2, 'selected': False, 'text': "<p>The motor is mounted in a fixed position no matter if it's on top or bottom.\nYou can imagine the lead screw as a rod hanging down and supporting the bed in the Z direction only, because all of the XY rigidity comes from the Liner rails the bed is attached to it works just as well if the stiff rod is under compression instead of hanging from the rod.</p>\n<p>Any forces that might &quot;pull it straight&quot; are the same forces that can cause Z wobble so you would not want to even try to use the misalignment to straighten a bent lead screw.</p>\n<p>The only thing this that really changes with this orientation is if the lead screw is under tension or compression. Even a relatively thin lead screw can easy counter the forces of gravity and the forces is the same in both directions. Its easy and cheap to make a smooth rod or rail straight but not so easy to make a threaded one straight.</p>\n"}, {'answer_id': 18086, 'author': '0scar', 'author_id': 5740, 'author_profile': 'https://3dprinting.stackexchange.com/users/5740', 'pm_score': 2, 'selected': False, 'text': '<p>No, but the answer could depends on how you set up the lead screws, what kind of lead screws are used and how they connect to the stepper. Also it is important how you transfer the linear Z motion into the X gantry.</p>\n<p>Note that regularly used TR08 (<a href="https://3dprinting.stackexchange.com/a/5668/">Trapezoid, 8\xa0mm</a>) lead screws are stiff enough to not flex under the limited load of an X gantry. So, putting them upright or down should not make a difference. Furthermore, the whole X-gantry is usually constraint in movement by the use of linear guide rods or rails.</p>\n<p>Note that lead screws are not perfect, certainly the cheaper versions (ball screws are better in that respect). The imperfections can cause the lead screw nut to move in the X-Y direction. If the nut is firmly attached to the X-gantry, this movement can be seen in the print like e.g. waves in Z-direction we call Z-wobble. There are designs like <a href="https://www.thingiverse.com/thing:2588347" rel="nofollow noreferrer">these</a> or <a href="https://www.thingiverse.com/thing:2910524" rel="nofollow noreferrer">these</a> to mitigate that problem. Leaving one end free (so not constraining both ends) of the lead screw is also a mitigation as with constraining both sides, you over-constrain the screw. Note that the spring couplers you see applied frequently are great for misalignment of stepper motor shaft and lead screw, but are detrimental for the Z-axis. When using such couplers for shaft misalignment, you should <a href="https://www.thingiverse.com/thing:2121687" rel="nofollow noreferrer">constrain at least motion in Z-direction</a>.</p>\n'}]
['https://3dprinting.stackexchange.com/questions/18088', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/31214/']