Printer stuck at E Heating

[nilathedragon]

Hey there!

Thank you for providing us with a precompiled binary to use with the Kossel Printer!
Its working great, except that I have to preheat manually... If I do not preheat manually and start the print when its above the threshold, the printer gets stuck at E Heating and I have no clue why...

Its happening with SD Prints as well as Cura USB Prints. Do you have any idea what could cause that? I am on your latest release btw.

[knutwurst]

Hi :)
I'll take a look into it an come back to you later, ok?

Thanks for the hint!

[nilathedragon]

Thats fine for me! Thanks for checking it out

[ptc]

Any updates on this? I've noticed that it just takes longer to start the printing process: The nozzle temperature will oscillate between 196°C and 206°C for some time and eventually printing starts.

[HenningTimm]

I can also confirm this.

On the first day all prints worked, one after being stuck in E Heating for about a minute. Today it got stuck, I restarted the print process 3 times and after a total of 30 minutes preheating I gave up. This might be due to unstable temperature in the hotend. I will try to better insulate the heat block and if that doesn't work will dive into PID tuning (https://drucktipps3d.de/pid-tuning-stabile-temperaturen-fuer-den-drucker/).

Update: With an insulated hotend (silicone sleeve) and long preheating the print started almost instantly. I am not sure if this that actually fixed it (since my current sample size is n=1), but it might be worth trying.

Update 2: Sample size n=3. The second print worked without problems and printed immediately after heating. The third print did not start at all got stuck in preheating limbo.

Update 3: Sample size n=4. I had to cancel one print, because it did not start.

Update 4: Sample size n=5. While the printer oscillated between temperatures on heat-up, I performed some additional external cooling of the heat block (Out of a whim, I blew on my hotend), when the temperature started to overshoot my target temperature of 200C. Then the print started. I am absolutely not sure if this is reproducible, but at least this got my printer running and made me laugh a lot.

[HenningTimm]

Performing a PID-Tuning solved this problem for me. I followed the (German) guide I posted above, but this one (English) describes the basically the same process.
After PID-Tuning the nozzle temperature was stable, i.e. only fluctuated by ±1°C. The print started immediately.