The UM2 hotend can heat-up about 3.5 degree per second.
I'm pretty sure you should be looking at a mechanical problem, trying to hide this with firmware tweaks will only make it worse in the end.
The UM2 hotend can heat-up about 3.5 degree per second.
I'm pretty sure you should be looking at a mechanical problem, trying to hide this with firmware tweaks will only make it worse in the end.
It can go up 10 degrees in 3 seconds but it takes much longer to go down 10 degrees.
Is a "couple of seconds" 3 seconds? Or does it jump faster. 3 seconds is a long time.
If it's changing much faster than 10 degrees in 3 seconds then probably a loose wire.
Thank you for your advice - I really appreciate!
The problem turned out to be caused by myself - I shouldn't have cast any doubt on firmware before investigating the root of the problem more carefully. As I have added airflow for my print head, I had ended up draining too much current from the fan output:
http://umforum.ultimaker.com/index.php?/topic/6307-um2-twin-tornadoes/
I added a note about the potential problem to the end of the thread. Now, after switching the fans to a separate power source, the temperature readings are steady again.
Thank you again for your help. As I had already checked the system for connection problems, your messages convinced me there had to be something more fundamentally wrong.
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christopher-luy 0
Before going to this extreme, be sure to check the themocouple connections. I had a loose thermocouple wire on one of the connectors that caused the same wild temperature fluctuations. Could possibly also be a failing thermocouple.
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