On my Prusa i3 my temperature drops from 195c to in its most significant drop of 170c. I have attached a picture of my temperature time graph. What could cause this significant of a drop? Often thermal runaway is tripped as it takes to long to get temperature back up. I am using 1.75mm white hatch box pla through a knock-off j head. 40w heater and standard thermistor. Using Cura for slicing. Black arrows for marking temprature drops. 1st arrow also marks start of print. https://reprap.org/forum/read.php?1,575299,575299#msg-575299 Sat, 08 Aug 2026 05:27:43 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,575299,575607#msg-575607 https://reprap.org/forum/read.php?1,575299,575607#msg-575607
Try extruding into thin air very slowly, if the temperature drops see if it is less, than when you extrude filament quickly.

Or maybe just replace the heater cartridge anyway.

I am sure there are ways to check the heater cartridge electrically i.e. resistance/current flow that will give you a more precise diagnosis.]]> DjDemonD General Mon, 26 Oct 2015 12:21:18 -0400 https://reprap.org/forum/read.php?1,575299,575310#msg-575310 https://reprap.org/forum/read.php?1,575299,575310#msg-575310 gmckee General Sun, 25 Oct 2015 19:42:01 -0400 https://reprap.org/forum/read.php?1,575299,575306#msg-575306 https://reprap.org/forum/read.php?1,575299,575306#msg-575306
Check it it still securely attached to the hot end. even a mm gap will cause many degrees drop in readings.]]> Dust General Sun, 25 Oct 2015 19:27:04 -0400 https://reprap.org/forum/read.php?1,575299,575299#msg-575299 https://reprap.org/forum/read.php?1,575299,575299#msg-575299
Black arrows for marking temprature drops. 1st arrow also marks start of print.]]> gmckee General Sun, 25 Oct 2015 18:55:33 -0400