Hotend heater problem
Hello,
I write this post because I have problems with my MK3S+.
I used it many times for the past 1 year without any problem. One day, I let it run at night, but when I woke up, there was a huge amount of PLA stucked to the nozzle. I removed it (with a lot of patience) using heat from a soldering iron, but some mechanical parts got damaged. I reprinted the damaged parts and assembled the new parts replacing the old ones (to do so I had to remove some connections from the board and put them back after). I also changed the left fan as well as the heating system by brand new components (because they also got damaged)
When I tried to heat the nozzle, nothing happened and I noticed that one of the 5Amps fuse (the top one) had blown for some reason (I don't know the reason). When I noticed the problem, I changed it. I then wanted to recalibrate the whole printer but by the time I recalibrated fans, axis and so on, the new fuse blew again (and I still can't heat the nozzle).
Anyone has an idea where the problem can come from ? Or tell me what I have done wrong ?
Thank you for your advices.
JG
RE: Hotend heater problem
It sounds like you have a short circuit in the wiring. Probably that of the heating element... Perhaps you can see it visually, or otherwise you can test with a multimeter.
If the wire is indeed damaged and shorts at the point (or close to) where the wire is connected to the heating element it is hard to repair. However, replacing the heating element is not very difficult and it's luckily not a very expensive part.
RE: Hotend heater problem
At the MK3S+ heatercartridge (24V, 40W) you should measure a resistance of 14.4 ohms, thermistor about 100 kohms at 25 deg. roomtemperature.
wbr,
Karl
Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.
RE: Hotend heater problem
Thank you for your replies.
I finally found the problem. When I measured the resistance at the cartridge, I didn't get the same value as yours. That lead me to check the reference of the heatercartridge I used. When I changed it, I put one of 12V (a spare from another printer), whereas I needed a 24V one ...
I feel both stupid and releaved that I finally found the issue. My printer is now operational !
Thank you !
JG