Print stops at certain point

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Re: Print stops at certain point

Postby ednisley » Mon Jan 22, 2018 6:38 pm

morganfree wrote:What could be that issue?


That's a PID loop with a bit too much P or I gain, so it oscillates.

Run a firmware PID auto-tune, store the results in EEPROM, and the temperature should be stable.
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Re: Print stops at certain point

Postby morganfree » Tue Jan 23, 2018 9:24 pm

Thanks Ed!
Well, I did the PID auto-tune but it seems that the T continues unstable... it seems a little bit less, but not as stable as I use to see it.

Should be the heater again? I just replace it...
Should I do the process more than once?

I'm printing just fine, but those variations are noticeable at part's exterior surface, especialy with PLA.

Any other idea?

Thanks a lot!
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Re: Print stops at certain point

Postby ednisley » Tue Jan 23, 2018 10:21 pm

morganfree wrote:Should I do the process more than once?


Once is enough: the numbers represent the best fit for a given set of conditions.

However, if you did the tuning from a room-temperature start, you may get better results by manually preheating the extruder to about 200 C before auto-tuning.

Remember to store the final results in EEPROM! If you don't, then the new values Go Away when you turn the power off. Next time, the firmware will fetch the old values from the EEPROM, just as if you did nothing.
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Re: Print stops at certain point

Postby morganfree » Wed Jan 24, 2018 8:33 pm

I see, I'll do the tune again with the manually preheating.

Yes, I'm storing the results with the M500 code ( M500 P**** I**** D****). I guess it's ok.

I'll let you know later about the new setup.

Thanks
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Re: Print stops at certain point

Postby ednisley » Wed Jan 24, 2018 8:41 pm

morganfree wrote:M500 P**** I**** D****


I think you don't need the PID parameters, just the M500, but, given the number of Marlin variations in the wild, there's absolutely no way to tell.

If you can look at the console log when you turn it on, you should see a dump of the parameters the firmware is using: it's the the only way to be sure.
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Re: Print stops at certain point

Postby insta » Thu Jan 25, 2018 6:50 am

You aren't saving the PID properly.

It's something like M301 P** I** D** to change the values in RAM, then a single M500 afterwards to commit all the firmware values to EEPROM.
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Re: Print stops at certain point

Postby ednisley » Thu Jan 25, 2018 2:03 pm

insta wrote:change the values in RAM


Huh. Yet Another Marlin Variation.

At least some Marlins update their in-RAM variables as part of the auto-tune sequence, so they're ready for the store-to-EEPROM step.

Definitely check the serial log to see what emerges when the thing starts up ...
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Re: Print stops at certain point

Postby morganfree » Thu Jan 25, 2018 2:50 pm

hahahaha it finally works as insta said.

M301 bla bla bla to upload the values
M500 to save them to EEPROM

Thanks a lot. T steady as hell!!!

Regards!
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Re: Print stops at certain point

Postby insta » Thu Jan 25, 2018 6:04 pm

The more "I told you so" tiffs Ed and I get into, the better the community is as a whole :lol:
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Re: Print stops at certain point

Postby ednisley » Thu Jan 25, 2018 10:46 pm

insta wrote:The more "I told you so" tiffs Ed and I get into


Damn straight!

We need a sticky thread of ITYS gotchas ...
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