Extruder polyfuse getting very hot and stopping print
Hi,
I've been using my 3d printer for about 6 months, with the extruder heating up perfectly fine. Suddenly, it has stopped heating in the middle of a print, i checked the 5amp polyfuse and it was extremely hot. When it cooled down again, it was fine. Now it has been triggering very fast, which means heating up much faster than it ever did. I don't know what to do next, because everywhere, people are having trouble with the 11 amp fuse. Im using a 12v 15a power supply.
I've been using my 3d printer for about 6 months, with the extruder heating up perfectly fine. Suddenly, it has stopped heating in the middle of a print, i checked the 5amp polyfuse and it was extremely hot. When it cooled down again, it was fine. Now it has been triggering very fast, which means heating up much faster than it ever did. I don't know what to do next, because everywhere, people are having trouble with the 11 amp fuse. Im using a 12v 15a power supply.
- Would it be wise to remove the fuse completely, and bridge the gap?
- If removing it is not a great option, then with what do i replace it? 5amp Polyfuses aren't available.
Comments
-2 check your heaters and motor drivers, usually fuse is not the problem
does heater voltage match the power supply voltage?
(usually 12 V heaters are around 6 OHms , 24V Heaters are around 12..13 Ohms)
yes my heater voltage is 12v which matches with my power supply. I read that the more the fuse is triggered, the more susceptible it becomes to being triggered again faster. Is it the fuse? Do i need to replace it with an automative fuse? If so, would a 5A one be fine?
Or what should i check to see whats going wrong?
thanks in advance:)
yes, you Need to measure the drawn current , otherwise you cannot see if the error is located at the Fuse or Heater
or any other component.
just straight forward toubleshooting
Also, I need to measure the current drawn from the motors etc. because if I've understood correctly, the fuse controls the flow of current to all of those loads. Could you please tell me how I measure that?
Sorry again.
Thanks
first of all measure the inrush current with your multimeter (select DC Amps).
https://dengarden.com/home-improvement/Using-a-Multimeter
Fuse is a safety element, it just disconnects when current is too high.
But the fuse has other loads attached to it, like stepper motors. How do I measure the draw from those loads?
not only heater
remove the +12 volt wire from the connector, then with meter set to dc AMPS range, connect the meter red wire to the 12v wire from power supply and the meter black wire to the +12 i/p of the connector
The current draw (with no load turned on) is 0.16 amps. I got this on my multimeter when i switched on power.
Can someone please tell me if that's normal?
if current is below the 5 amps your fuse might be bad , if current is more than 5 amps the problem is located some
where else
but one question. did you change anything before this issue started?
f.e. changed housing of electronics, removed blower etc.?
btw do you have a board fan?
if you cannot get such a polyfuse ,replacement by fuse type as used in cars would be possible.
its done also in some RAMPS Variations.