Hi, I replaced my ender 3 hotend assembly completely, when I turned it on and tried to heat up the nozzle to insert filament to 200 degrees, I suddenly smelled serious burning and looked at the screen to see that my temperrature was reading 245 degrees! I immediately shut off my printer in a panic. …

Can you post a photo of your thermistor wiring splice? From the motherboard, unplug the thermistor cable and measure the resistance of the (cold) thermistor. To know exactly what resistance it should be, you’d have to know what model of thermistor is being used in the new hotend assembly. When you…

Thanks for the reply. It turned out that the problem was not with what I did to the thermistor. I bought a 12V hotend assembly, but the Ender 3 is 24V. So the new heating cartridge was half the resistance value of the old heating cartridge, which led to the crazy fast increase in temperature and ove…

From personal experience in the shop most people that come in with problems like this and have soldered connections on Heater cartridges and thermostats always fail I highly recommend cramping ends on oversaw during for these applications soldering wires together is never a good idea in any applic…

But what would fail on it? I soldered the wires, wrapped in heat shrink tubing, then wrapped in electrical tape. There’s no chance of mechanical stress on the joints and my soldering skills are solid.

[image] PJprincefpv: soldering wires together is never a good idea in any application soldering wires to pads is fine but 3-D printers don’t work like that The Electronics Technologist in me just recoiled in horror.

40 years of experience as an Electronics Technologist tells me that @PJprincefpv is dead wrong, IF the solder joints are done properly. Yes, there are people who will try to solder unclean wires and/or not use flux or flux-core solder. Yes, there are people who will not twist the wires together tigh…

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Serious issue - ender 3 hotend spiked up to 245 degrees in under 10 seconds

Filament 3D Printer Technical Help Creality Ender 3 / 3 Pro / V2