<p>What should I take care of to replace the nozzle of the hotend assembly the right way?</p>
<p>What kind of data, precautions, tools, steps, and verification are important for replacing the nozzle?</p>
<p>The procedure seems straightforward but tutorials differ greatly and seem often incomplete. Online videos are great but long, sometimes misleading, and difficult to compare if they use another printer model.</p>
<p>For example:</p>
<ul>
<li>This <a href="https://www.youtube.com/watch?v=txt6sxV6X88" rel="nofollow noreferrer">Prusa 3D tutorial</a> starts from heating the nozzle to 280 °C, which is dangerous for some hotend setups. Also, it is created around a direct drive extruder, so it does not advise to what to do with a Bowden tube.</li>
<li>Another <a href="https://www.youtube.com/watch?v=FRzsGttNMyk" rel="nofollow noreferrer">Changing Nozzles &amp; Bowden Tubes video</a> seems to be a great tutorial but advises heating only to ~210 °C. So I need to make sure I know my hardware limits first? Should I take something else into account about temperature, or just act by experience, <a href="/a/11648/26170">starting from 230 °C</a>?</li>
<li>Is that heating mandatory, or only <a href="/a/5123/26170">when there is residue filament inside</a>? If there is something to consider about <a href="/q/8064/">replacement nozzle</a> before installing it, or cooling down again, like PID calibration?</li>
</ul>
<p>So I am looking for a general overview: <strong>what should I think of</strong> to be in control? And maybe a bit of <strong>why</strong>, but not necessarily how. (As always, each detail may be a separate study, so please don't to fall into troubleshooting, which could be done in separate questions like <a href="/q/11646/">E3D V6 nozzle seized into heater block</a>).</p>

[{'answer_id': 15520, 'author': 'user77232', 'author_id': 12857, 'author_profile': 'https://3dprinting.stackexchange.com/users/12857', 'pm_score': 2, 'selected': False, 'text': "<p>It's because the bed heats up. Since the bed can heat up to the point that locktite or nylon can soften, using those products to keep the screws from turning will have exactly the opposite effect.</p>\n"}, {'answer_id': 15526, 'author': 'Perry Webb', 'author_id': 15075, 'author_profile': 'https://3dprinting.stackexchange.com/users/15075', 'pm_score': 1, 'selected': False, 'text': '<p>Does your bed already have washers on the screws?  The neopreme (red) washer under the screw head (in picture).  This is the German Reprap X400 design and is worth trying.</p>\n<p><a href="https://i.stack.imgur.com/jucy3.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jucy3.jpg" alt="enter image description here" /></a></p>\n<p><a href="https://i.stack.imgur.com/V3qrL.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/V3qrL.jpg" alt="enter image description here" /></a></p>\n'}]
['https://3dprinting.stackexchange.com/questions/15521', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/26170/']