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My Dremel 3D45 stopped the extrusion. I removed the nozzle thinking about it was clogged. But still it didn't solve. Also the nozzle was harder to remove than usual.

So I removed the bottom cover and I found this:

enter image description here

enter image description here

It seems the heater is completely burned and messed up. Unfortunately the replacement parts are hard to find.

I'm wondering what could have caused this damage. I didn't run the nozzle over 220 °C (usually 195 °C) and the printer has less than 250 hours of working time.

It was just a defect? Or could I have prevented it?

Mark
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1 Answers1

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As you say that the nozzle removal was harder than normal it can be concluded that it has been removed before.

Looking at the hotend when new, enter image description here it evidently looks as if filament has been entrapped onto and on top of the heater block.

It could be that in a prior attempt to remove or replace the nozzle, the heat break has come loose or un-tightened as such that molten filament leaked on top of the heater block.

This hypothesis is more likely in this case than filament that has been ricochetted back from the nozzle opening back to the cavity containing the hot end (I recently experienced this latter issue on an Ultimaker destroying the core...).

0scar
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