Thermal Fuse blowing 2x row

[hunt529]

Guys,

I have a Rostock Max v3 with HE280.

I recently ran into a problem which I correctly identified was my thermal fuse.
http://forum.seemecnc.com/viewtopic.php?f=37&t=11772

I just replaced my thermal fuse and made another minor tweak and got it working again.


During my first print after the repair, my replacement thermal fuse blew. I took apart the HE280 again and verified it's the thermal fuse again.

I am going to replace the second thermal fuse -- but has any experience with multiple thermal fuses blowing consecutively? Should I cinsider this unusual or a pattern of something else? I am suspicious that I am losing thermal fuses to some incorrect configuration or something or the root cause is elsewhere ????

Previously I had been using PLA (printing successfully at hotend "210") and switched to ABS these are the first runs of my machine at a higher temp hotend "235".

Any ideas from the Forum?

Any ideas would be appreciated.

[Xenocrates]

If the fan is not running correctly, this can contribute to the fuse failing. In addition, the thermistor may be off-profile, making the print head hotter than you expect (Although it shouldn't be getting quite to the ~280C operating ceiling). I would double check your fan performance and that the heatsink isn't obstructed.