Hi guys i have a velleman k8200 and i use cura the latest version. I used to had problem with me heated bed and i changed the thermistor and now it is working. I also used to had problem with leveling but now im using glass bed and it is much better. So the problem now is that when the printer starts after 5 min the temp of extruder starting to fall.and i have a image like that.any ideas??
Three things come to mind:
- Bad connection. I have had many times that what I thought was a good extruder heat connection actually on the verge of falling out, so as soon as the printer started moving it disconnected intermittently.
- PID settings. Has anything changed?
- Fan settings. I have seen similar things happen if the fan is not on all the time and the PID is not tuned to adjust.
Good luck
Is there a fan being turned on there?
Yes there is a fan that is working but there was before.one thing that i want to check is if the thermistor is stabilized with the screw. The thermistor shouldnt had connection problems because in the start it measures ok.
Thermistor or the power to the hot end may be coming loose. But that would only be the case if you stopped the print, reset the controller and then couldn’t bring it back to temp after.
after you follow the other suggestions, Monitor the output of the circuit going into the hot end. It could be falling off or something is overheating.
confusing.*_ I hope you can fix this. Good luck to you.
The thing that’s weird here is that this is the temp as sensed by the thermistor, which is also responsible for controlling the extruder heater circuit. So as soon as the temp starts going down, the heater should be going full blast to compensate (unless there’s something in the g-code or the firmware that lowers the setpoint, which seems unlikely.) Is it possible your power supply just isn’t up to the task with the addition of a heated bed? Other possibility is that the extruder thermistor is faulty or just is losing good thermal contact with the extruder body and not registering the true temperature.
The other possibility that the connection to the heater is going bad (or the heater itself). Check your solder/crimp connections and the heater itself. I have had times where my nozzle heated up fine but then it had problems as soon as the head started moving because my connector solder was bad.
hello, i have read many subjects of this for the K8200,
and the best option was to improve the fan with a cone to minimise the reduction of the heat of the extruder and point it to the pieces you print. I hope it will help you
I tried the cone but it seems that it push less air. So these errors have gone with the cone?
It seemed that the fan reduce the temp of the extruder and that stops sometimes the print, need more time to rehot and restart with sometimes problems or need to restart from beginning the print or restart the printer did you try the online faq help of http://www.velleman.eu ?
Yes the screw that holds the thermistor was a bit loose so it was doing that.one tiny screw was responsible…oh 3d madness!!lol thanks guys for your help!