MakerGear Forum

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

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.

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

Where do I find that Jim?

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

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

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