Broke fan, and noticed extruder motor getting extremely hot.

[Mjolinor]

On my Wanhao I have added a Bakelite shim between the stepper motor and the heat transfer bar.

The risk with that is that it will prevent enough heat being removed from the bar and you will suffer melt back in the filament tube. Removing heat from that bar is what the fan does and it is critical to get it right. If too much heat is removed the filament will not flow and if not enough is removed then the filament will melt too far up the tube.

With a damaged fan the stepper will get hotter than normal but still probably not too hot and it will not print because of melt back.

Too hot to touch is quite a low temperature, certainly 60c is too hot to hold for more than a couple of seconds but a stepper is fine at that all day long.

[sinful]

without a right fan you wont be able to avoid constant extruder clogs. Please make sure you have installed new fan with the sticker looking inside to the heat sink and try again.

[curious aardvark]

800K hours.

that equates to 91 years non-stop.
I guess that could wear a motor out :-)

[sapient24]

that equates to 91 years non-stop.
I guess that could wear a motor out :-)

hahahahaha

[sapient24]

Got my new fan today. I replaced the nozzle with a new one. Torched the one I took off. And with the new fan, my Replicator 2 seems to be printing like the beast that it is so far. Extruder motor warm as usual.