Hot end not keeping temperature

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rixter
Posts: 9
Joined: Wed Aug 06, 2014 6:01 am

Hot end not keeping temperature

Post by rixter » Sun Aug 10, 2014 6:36 am

Hello, I recently got a new hot end under warranty from Makergear for my M2. It has been working perfectly for about a month but now the temperature keeps dropping quite a bit below where it's supposed to be. I set it for 238c and it stays there for about 10 minutes then drops to around 215 for the rest of the print.
Thanks, Rick

rixter
Posts: 9
Joined: Wed Aug 06, 2014 6:01 am

Re: Hot end not keeping temperature

Post by rixter » Sun Aug 10, 2014 7:17 pm

Apparently it must be the efficiency of my new bed fan I had to install. It's a 60 mm fluid bearing fan that's doing too good of a job so I'll have to compensate for that I guess.

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jimc
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Location: mullica, nj
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Re: Hot end not keeping temperature

Post by jimc » Sun Aug 10, 2014 7:57 pm

Run the pid autotune sequence. Do it with the fan running.

rixter
Posts: 9
Joined: Wed Aug 06, 2014 6:01 am

Re: Hot end not keeping temperature

Post by rixter » Sun Aug 10, 2014 8:58 pm

Where do I find that Jim?

Dale Reed
Posts: 376
Joined: Thu Apr 10, 2014 1:39 am
Location: Cleveland Heights, Ohio USA

Re: Hot end not keeping temperature

Post by Dale Reed » Sun Aug 10, 2014 9:10 pm

Rick,

Here's one reference: http://reprap.org/wiki/PID_Tuning
Also see: http://reprap.org/wiki/Gcode

The basic procedure is this:

1. Start with the extruder temperature well below where you normally run.
2. Use the M303 G-code command (syntax in the above references) typed into your communication program "send" line to initiate the autotune sequence.
3. Write down the P gain, I gain and D gain values that it produces.
4. Use the M301 G-code command (see the references) to send those gains to the firmware. They are held in RAM temporarily.
5. Test the temperature control. If you like it, go to step 6. If no, go back to step 2.
6. Save the new PID parameter to EEPROM (so they take effect even after you cycle power) using the M500 G-code command.

Hope this helps!
Dale

rixter
Posts: 9
Joined: Wed Aug 06, 2014 6:01 am

Re: Hot end not keeping temperature

Post by rixter » Sun Aug 10, 2014 10:52 pm

Thanks a lot Dale, I had no clue about any of that so I'm sure it will be very helpful!
Rick

markb
Posts: 180
Joined: Tue Apr 15, 2014 11:06 pm

Re: Hot end not keeping temperature

Post by markb » Wed Aug 13, 2014 2:29 am

Thanks for posting this. Mine looked like a roller coaster.
After PID tune it looks great.
I never did this before so this video help me.
http://www.youtube.com/watch?v=APzJfYAgFkQ

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