Replacement Heat Core - new design (Page 1 of 2)

Temps seem to be a little all over the place, but I don't have the right width kapton so I had to cut a stip from some 6" wide stuff and it was a little awkward taping the thermistor in place.  I might be a little looser than I should be. 

Any long term issues with this as long as the wraps are around it or should I get some thin tape and redo it?

M303 S200 to autotune around 200C

The PID auto tune helped enormously after I switched hot ends.

I don't think you can from Pronterface without recompiling firmware.

Just install Repetier, use it to store the EEPROM values, and go back to Pronterface.

You can do it from Pronterface - If you enter M500 it will store the current values into EEPROM.  It's easier with Repetier though, you get a form that shows you what the current values are.

Cmetzel, were you able to get the pid values into the EEPROM through pronterface?  I won't get my new hotends for a couple more days, but with a lot of new hot ends coming out it seems like a good time for another write up since this has been asked quite a few times now.

do i just add M303 S200   into the manual page gcode and send ? i tried it and i still get 20 degree heat fluctuations.

Forgot to come back to update.  I ran the autotune using pronterface, but I put the values in through RH since they have a nice interface for it. 

I still print from pronterface and it seems to have helped, although from time to time I notice that my set temp changes from 195 to 200 by itself, don't know what that is about.

But I'm back in business printing again.

"The PID auto tune helped enormously after I switched hot ends."

I M303 S200 C(x) anytime I change anything with hardware or software.  It can't hurt; just set X for a reasonable amount of cycles so you get a good number w/o cooking the filament and clogging.

Interesting issue with the new hot end and temperature control.  My extruder has been stable within 1-2 degrees most of the time.  However, since I've been running 4-5 hour prints there seems to be a longer cycle where the hot end will stay stable for five minutes and then fluctuate more wildly for 5 minutes a ways into the print.  When it fluctuates wildly, it swings back and forth about 10-11 degrees.  I understand thoroughly how PID controls work and I did run the autotune, but I don't understand what the additional input would be that would cause the change in stability. My case is completely enclosed and I am not running the fan.  Is it possible the MOSFET needs additional help cooling? There is already a fan on the electronics, so I guess the only thing I could do is add another fan or a bigger heat sink.  Any other ideas?