Thermal Runaway Triggers during first layer When I leave the hotend on while not printing it stays at a constant temprature. Once I begin a print the temp drops from 195 to 170 and then thermal runaway triggers. I have tried using 210c and it also triggered at about the 3rd layer. I'm using Marlin with standard thermal runaway settings. Printing with 1.75mm white plastic using a j head style hotend. https://reprap.org/forum/read.php?1,574941,574941#msg-574941 Wed, 22 Jul 2026 04:17:12 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,574941,575341#msg-575341 Re: Thermal Runaway Triggers during first layer https://reprap.org/forum/read.php?1,574941,575341#msg-575341 sungod3k General Sun, 25 Oct 2015 23:53:27 -0400 https://reprap.org/forum/read.php?1,574941,575313#msg-575313 Re: Thermal Runaway Triggers during first layer https://reprap.org/forum/read.php?1,574941,575313#msg-575313 nebbian General Sun, 25 Oct 2015 20:06:07 -0400 https://reprap.org/forum/read.php?1,574941,574941#msg-574941 Thermal Runaway Triggers during first layer https://reprap.org/forum/read.php?1,574941,574941#msg-574941 gmckee General Sat, 24 Oct 2015 19:36:23 -0400