I have a dual head k8400
Yesterday is happend something very strange.
At the end of a print, the nozzle stays continue on and the temperature was going very high.
The result of this is that the nozzle was melting out of the head
So the head is broken.
The sensor still working because i pulled out of the net and a couple of minutes later i’ll put it back in and the temperature was stil decreasing and was on that moment still 145°
What can be done to solve this problem.
(I am intended to give a demo on 28/2 for a big group but …for me is this a big problem) dropbox.com/s/ctafn0654yvzkkt/foto2.JPG
Usually if the temp sensor gives wrong values, the controller goes into an error mode and disables the
hotend immediately. I had such an issue with an broken temp sensor.
But in your case the heater was not disabled…
Do you print by SD-Card or from PC by ReptierHost?
You should use RepetierHost because you may control the heat temperature and you see how often
the controller switched on the heater. You should try this before you replace the isolator part (manually without printing).
Try to shake your cables (sensor and heater) mounted on the printhead electronic.
Maybe you see some changes on the diagram…
I was printing with Repetier-Host from pc.
When i restarted the printer, it looks ok.
(temperature)
The display was showing 207° while the heating was on, but the temperature was much higher. You can see the melted part in the photo.
I hope that there is a solution for (an other isolator, sensor, heather and the copper piece)
I think the sensor had such high temperature that i doubt the sensor is 100% ok anymore
No i’m in a position with big problems because within 20 days i promised to give a demo for a big group.
That is not an advertisement for the demo of course.
Hopefully can velleman help me to solve this problem.
When printing from Repetier Host you should also have the temperature curve stored.
There are also information about the controller heater output state!
Do already checked this diagram?
And by the way: In RepetierHost the printer is very sensitive about all kinds of electric
discharges (just in this moment my 3D stopped printing due such an issue).
Does in your case your ReptierHost also broken the connection?
i can’t see this curve anymore
The connection was not broken so far i think.
But i putted the printer out of the electricity due the smel. I£t was a sort panic when i saw the heather hanging.
We are afraid that at this time we cannot tell what exactly went wrong.
Anyway, we’ll replace the damaged parts.
Please supply an address and ordercode of the damaged parts (you can find the codes in the manual, when you hover over the item) to supportatvellemandotbe and we’ll make sure you’ll receive them.
I’ve noticed a print just stops, but heating is still controlled by Marlin. This head fall off case, the Marlin is total out off control, but are reset by reconnecting the PC. This type off failure is very rare.
These failure is related too spikes on the power line (110/220V). These failure can be provoked by other hardware that has a bad switch like a mechanical one in an old micro stove.
Supply the kit with a bit more expensive PSU, just too eliminate these problems.
[quote=“hudibras”]I’ve noticed a print just stops, but heating is still controlled by Marlin. This head fall off case, the Marlin is total out off control, but are reset by reconnecting the PC. This type off failure is very rare.
These failure is related too spikes on the power line (110/220V). These failure can be provoked by other hardware that has a bad switch like a mechanical one in an old micro stove.
Supply the kit with a bit more expensive PSU, just too eliminate these problems.
Max Nielsen[/quote]
Wouldn’t help that much, cause the USB connection is almots always directly mains earth grounded.
[quote=“ichbinsnur”]
Wouldn’t help that much, cause the USB connection is almots always directly mains earth grounded.[/quote]
That’s why I always use standard PC-PSU never these cheap ones like the one for K8400.
A normal [color=#0000FF]private[/color] household don’t have there equipment connected to green/yellow wire.
Thereby they have a very good receiver for spikes - sorry
[quote=“hudibras”][quote=“ichbinsnur”]
Wouldn’t help that much, cause the USB connection is almots always directly mains earth grounded.[/quote]
That’s why I always use standard PC-PSU never these cheap ones like the one for K8400.
A normal [color=#0000FF]private[/color] household don’t have there equipment connected to green/yellow wire.
Thereby they have a very good receiver for spikes - sorry
Max Nielsen[/quote]
Mains protective earth (green/yellow) is always connected to mains earh neutral (blue) at least in the electrical mains terminal of the building.
Also almost ervery electronics device have the ground connected to mains earth ground (or neutral) through the power supply.
That way the ground line has earth potental too.
Measure yourself from the USB shield to protection ground (green/yellow) or from neutral (blue) to earth on your wall socket.
But, be careful not to get shocked, if you do!
[quote=“ichbinsnur”][quote=“hudibras”]Sorry to inform you, that does not totally prevent spikes from other eqipment.
Max Nielsen[/quote]
I didn’t say that.
I only wanted to make clear that the ground connection is still a possible source for interference.[/quote]
My ground connection is OK but I also noticed some strange temperature behavior from the printer and don’t know
if it is the Marlin or Repetier soft who is in control at the moment it happend.
[quote=“ichbinsnur”][quote=“hudibras”]Sorry to inform you, that does not totally prevent spikes from other eqipment.
Max Nielsen[/quote]
I didn’t say that.
I only wanted to make clear that the ground connection is still a possible source for interference.[/quote]
Yeah, otherwise you have to help the guy (the Marlin just hangs sometimes)
If you experience that kind off environment, you will have too live with it. Be aware off an old light switch etc. can trigger this.
