Thanks! I couldn't feel any break in the wire at all in the back of the extruder, but went ahead and replaced it with a section of servo wire and now works as good as new.
My print fan went just broken a view hours ago. Thanks to the video I was able to find the root cause. Exactly the same phenomena. Im my case however the broken area was just on the Einsey terminal box, means on the opposite side. THANKS for posting this video 👍🏻👍🏻👍🏻
What worked for me was to update to the Prusa Build suggestions of removing the spiral wrap altogether and the filament core that they have in the bundle, then wrap the wires with cloth wrap. This not only spreads the bend of the wire out over the full length of the bundle it also make the carriage eayer for the stepper motor to move so less chance of a layer shift do to skipped steps.
I've just had this exact same problem after printing almost constantly for a year now. I'll for sure print out this strain relief. After all it "Fits Like a Glove". I also liked the Dunh, Dunh, Dunh in the first of the video. Good stuff!
I bought all your books already and enjoy them. Now I just need to find my Pursa i3 MK3 that you say i've had for awhile and don't remember buying. ^_^
No problem at all. By the way, I also ended up having the same problem with the thermister wires just recently even with my newfangled strain relief. The failure simply happened somewhere else in the middle of the bundle. I think the key, like another comenter said, is to remove the spiral wrap altogether. He suggested to wrap the wires a special cloth wrap, and I may do that at some point, but for now I'm just letting everything hang loose and it seems to be ok. Although, I'll admit, it does not look too great. Cheers.
I just had this same problem with my new i3 MK3S. The yellow wire from the fan was broken. In my case, it happened at the strain relief where the wires go to the main board. The wire got pinched when I tightened the screws on the strain relief and eventually broke inside the insulation. For those of you who don't know, there is an easy way to find out where a wire is broken inside of the insulation. All you have to do is pull on the wire as if you are trying to stretch it. If the wire is good where you pull, it won't stretch. But if it is broken inside the insulation it will not only stretch, but eventually pull apart right where the wire is broken. Then you can strip and splice right there and not have to deal with replacing the whole wire. I just slid some shrink tube over the wire far enough so the bare end stuck out, soldered the ends together and then slid the shrink tube back over the solder joint and heated it enough to shrink it down. Good as new!
I had the same issue with the cable of the bed thermistor. It cut off in the insulation where it exit the 3D printed connector (connected to the bed). I've fixed the cable, but maybe I should print a strain relief as well
You would think that the people at PRUSA must encounter this sort of thing all the time, especially considering that they have a "Printer Farm" with dozens of printers running 24 hours a day. So WHY don't they address the strain relief problem with a better design??
I just came back to this error and resumed print. Seems ok but I’m sure it’ll happen again. I have a new MK3S and it doesn’t have this hard spiral wrap with this new version but it is still happening to people. It’s unfortunate because the printer is amazing otherwise.
After a few weeks of printing I had exactly the same problem, was able to keep printing for a while by turning off the checks, but it got worse and worse. I will probably try the cloth wire bundle holding trick listed in the comments (thank you!)
I'm glad I could help. I've actually been going bareback these days. Er, that is, with no covering on the wires and just a few tie wraps to keep it neat. Not the prettiest solution, but my wires are no longer breaking so it's all good.
I'm getting this error message. I cleaned out the stray filament wisps that I found. Still got error. The fan appears to be working fine. I turned off the fan sensor for now so that I can at least finish my 4 hour print. (failed at 3 hours in.)
There are three wires going to the fan: a black ground, a red power, and a white sensor wire. It is possible that there is a problem with the white wire so the fan would still operate but the MK3 is not able to sense that it is actually running and throws the error.
Just ran into this issue on my i3 MK3. Thank you for the video, I was able to easily identify the same problem that you have demonstrated.
I've been having this issue for like a week now and it's been driving me INSANE. You're awesome, thank you for this.
Thanks! I couldn't feel any break in the wire at all in the back of the extruder, but went ahead and replaced it with a section of servo wire and now works as good as new.
My print fan went just broken a view hours ago. Thanks to the video I was able to find the root cause. Exactly the same phenomena. Im my case however the broken area was just on the Einsey terminal box, means on the opposite side.
THANKS for posting this video 👍🏻👍🏻👍🏻
I'm glad you found the problem. That is interesting that it happened by the control box.
To be more specific, it happen exactly on the top of the Einsey box. Thanks again!
What worked for me was to update to the Prusa Build suggestions of removing the spiral wrap altogether and the filament core that they have in the bundle, then wrap the wires with cloth wrap. This not only spreads the bend of the wire out over the full length of the bundle it also make the carriage eayer for the stepper motor to move so less chance of a layer shift do to skipped steps.
Thanks - that sounds like a good idea. I may end up doing just that.
Here is a link to vid I did on it. th-cam.com/video/M6TsgB9yxXw/w-d-xo.html
I've just had this exact same problem after printing almost constantly for a year now. I'll for sure print out this strain relief. After all it "Fits Like a Glove". I also liked the Dunh, Dunh, Dunh in the first of the video. Good stuff!
Thank you so much! I'm on my 3rd fan replacement and it was driving me nuts not being able to figure out why they were failing.
I bought all your books already and enjoy them. Now I just need to find my Pursa i3 MK3 that you say i've had for awhile and don't remember buying. ^_^
Thank you for the diagnosis and repair. I have the same issue.
No problem at all. By the way, I also ended up having the same problem with the thermister wires just recently even with my newfangled strain relief. The failure simply happened somewhere else in the middle of the bundle. I think the key, like another comenter said, is to remove the spiral wrap altogether. He suggested to wrap the wires a special cloth wrap, and I may do that at some point, but for now I'm just letting everything hang loose and it seems to be ok. Although, I'll admit, it does not look too great. Cheers.
you were spot on, your vid helped me diagnose the same problem quickly and im printing your strain relief in TPU right now. Thanks!
I just had this same problem with my new i3 MK3S. The yellow wire from the fan was broken. In my case, it happened at the strain relief where the wires go to the main board. The wire got pinched when I tightened the screws on the strain relief and eventually broke inside the insulation. For those of you who don't know, there is an easy way to find out where a wire is broken inside of the insulation. All you have to do is pull on the wire as if you are trying to stretch it. If the wire is good where you pull, it won't stretch. But if it is broken inside the insulation it will not only stretch, but eventually pull apart right where the wire is broken. Then you can strip and splice right there and not have to deal with replacing the whole wire. I just slid some shrink tube over the wire far enough so the bare end stuck out, soldered the ends together and then slid the shrink tube back over the solder joint and heated it enough to shrink it down. Good as new!
Thanks @0Calvin. Looking into why my MK3S cooling fan is intermittently stopping using your methods :( Cheers, JAYTEE
I had the same issue with the cable of the bed thermistor. It cut off in the insulation where it exit the 3D printed connector (connected to the bed). I've fixed the cable, but maybe I should print a strain relief as well
You would think that the people at PRUSA must encounter this sort of thing all the time, especially considering that they have a "Printer Farm" with dozens of printers running 24 hours a day. So WHY don't they address the strain relief problem with a better design??
I just came back to this error and resumed print. Seems ok but I’m sure it’ll happen again. I have a new MK3S and it doesn’t have this hard spiral wrap with this new version but it is still happening to people. It’s unfortunate because the printer is amazing otherwise.
Thanks for the vid. Will try your fix. Hope its the cause of our problems.
Good luck!
Same problem, will check it today/tomorrow, thanks for diagnosis, I thought the same, wire will be broken I bet...
i suggest using wire with silicone insulation, should be better
This helped me a lot. I printed the part and it workes great. thank you!
Excellent. I'm glad it helped.
@@0calvin What material did you use to print the part? does the material have to be bendy? or can it be PLA or ABS?
After a few weeks of printing I had exactly the same problem, was able to keep printing for a while by turning off the checks, but it got worse and worse. I will probably try the cloth wire bundle holding trick listed in the comments (thank you!)
I'm glad I could help. I've actually been going bareback these days. Er, that is, with no covering on the wires and just a few tie wraps to keep it neat. Not the prettiest solution, but my wires are no longer breaking so it's all good.
I will keep that in mind, I hope that Prusa retro fits something to fix this 100%, has anyone sent him feedback? Thanks again
I just checked the latest kit build manual online (3.05) and they still call out the spiral wrap, so I'm guessing this issue has not been addressed.
I'm getting this error message. I cleaned out the stray filament wisps that I found. Still got error. The fan appears to be working fine. I turned off the fan sensor for now so that I can at least finish my 4 hour print. (failed at 3 hours in.)
There are three wires going to the fan: a black ground, a red power, and a white sensor wire. It is possible that there is a problem with the white wire so the fan would still operate but the MK3 is not able to sense that it is actually running and throws the error.
@@0calvin Thanks for the info. Fortunately for me, I also have an Ender 3 to fall back on. :)
Did you make it with PLA? Prusa are replacing my fan but would like to make this to stop it happening again.
It was made with Ninjatek Semiflex (TPU). It needs to be made from something flexible.
I have the same issues even with a drag chain... :(
I got the "Print Fan Error" tonight and tried your fix, my fan kept spinning. I guess I'll be contracting PRUSA tomorrow.
Weird. Maybe a stray filament strand had blocked it temporarily?
Nice video. It was a big help.
I have the same issue, thx!!!
nice!