<p>Since I have lots of PETG, I ran tuning to 230 °C (average temp for my filaments).
What is it good for, in terms of temperature ranges?</p>
<p>For the same printer configuration, and just different filaments, will I need to run it again and again?
Let's assume that I'll be printing between 200 °C and 240 °C.</p>
<p><a href="https://i.stack.imgur.com/SOVjm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SOVjm.png" alt="marlin pid via octoprint" /></a></p>

[{'answer_id': 15575, 'author': 'octopus8', 'author_id': 26170, 'author_profile': 'https://3dprinting.stackexchange.com/users/26170', 'pm_score': 1, 'selected': False, 'text': '<p>It\'s not a straight answer, but you don\'t have to run PID tuning every time you decide to print with different temperature. (Until you change something in a hardware near or related to the hotend.)</p>\n<p>You can tune PID for different temperatures and grab necessary values, for example:</p>\n<pre><code>M303 C16 D1 E0 S190\n22:14:31.872 &gt; PID Autotune finished! Put the last Kp, Ki and Kd constants from below into Configuration.h\n22:14:31.886 &gt; #define DEFAULT_Kp 30.87\n22:14:31.886 &gt; #define DEFAULT_Ki 3.06\n22:14:31.886 &gt; #define DEFAULT_Kd 77.75\n</code></pre>\n<p>and then store respective G-code commands (like <code>M301 P30.87 I3.06 D77.75</code>) as few different &quot;PID profiles&quot; as new entries in <em><a href="/q/7676/">custom menu for Marlin</a></em> or <em>menu.cfg for Klipper</em> for quick switching.</p>\n'}, {'answer_id': 15580, 'author': 'FarO', 'author_id': 2338, 'author_profile': 'https://3dprinting.stackexchange.com/users/2338', 'pm_score': 3, 'selected': True, 'text': '<p>PID tuning can be performed multiple times and the results saved for future use, since the question is about &quot;what are the usable ranges for PID tuning&quot;, based on my experience</p>\n<ol>\n<li>a slightly suboptimal tuning will not make the temperature oscillate more than 2-3 degrees, which is more than enough for most traditional filaments</li>\n<li>if you have a 30-40 °C temperature range you can likely keep a tuning in the middle and be done with it</li>\n<li>an accurate tuning is needed if you run the hot end at its maximum rated temperature: mine was rated 250 °C and without a good PID tuning the temperature was overshooting by 2-3 degrees, which was enough to trigger a over-temperature safety shutdown. Using the printer at 245 °C would have resulted in no issues even with sub-optimal PID tuning.</li>\n</ol>\n<p>Of course, people with high temperature hot ends (up to 270-300 °C or more) will need a tuning for the usual range (200-240 °C) and one for the higher temperature range to obtain better prints.</p>\n'}]
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