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I installed my new E3D, changed the max temp in the firmware to 350 then updated firmware on my board, now when I try to do the final step of bringing it to 300c then once at temp give the nozzle one final wrenching to tighten against leaks, my machine wont let it get there!

At like 299c the LCD screen says "def" for both NOZ and BED temps and my Repetier log says:

22:16:01.964 : extruder 0: temp sensor defect
22:16:01.964 : heated bed: working
22:16:01.964 : Error:Printer set into dry run mode until restart!
22:16:25.483 : extruder 0: working
22:16:25.487 : heated bed: working
22:16:25.487 : Error:Printer set into dry run mode until restart!

Then my hot end loses power and temp starts going back down.

I'm using the thermistor sent with the E3D and I have confirmed there are no shorts. I'm at a loss, I want to get this bad boy installed and working so I can see how wonderfully it really prints!

Please help if you can!

I am using the screw in thermistors and had no problem going to 300°C. If you can get to say 295° just torque it at that temp, a few degrees won't make a difference.

Yeah I can do that, which I probably will, but I want to know why my printer is doing this. I should be able to bring it to 350 or 400 if I want for whatever reason.

Could this be due to max PID values in the firmware? What else should be changed in the firmware, I would imagine I should do the PID auto tune with the new hot end but I cant get it as high as it can go without the firmware blocking shutting me down!

If anyone has any clue as to why this is happening I'd appreciate an explanation or even just an idea! lol!

Thank you!!!

AndThenSome09 wrote:Yeah I can do that, which I probably will, but I want to know why my printer is doing this. I should be able to bring it to 350 or 400 if I want for whatever reason.

Could this be due to max PID values in the firmware? What else should be changed in the firmware, I would imagine I should do the PID auto tune with the new hot end but I cant get it as high as it can go without the firmware blocking shutting me down!

If anyone has any clue as to why this is happening I'd appreciate an explanation or even just an idea! lol!

Thank you!!!

There is a max temp setting in firmware you need to find out which thermistor table you are using, usually it is one and then find a statement like this one:
#define GENERIC_THERM1_MAX_TEMP 300 change the max temp setting. This is all in configuration.h

There no need to take it to 300. 285 is totally fine. That thermistor is only rated up to 300 anyway. Only reason you'd need to go hotter is to print PC. I'd recommend against that for a while. It's a whole different animal.

Yeah, I just found by way of searching through the configuration.h file that I needed to change the EXT0_TEMPSENSOR_TYPE from 97 to 8 since the new E3D comes with a Semitec thermistor.

Should I change the PID max temp so I can use PID auto tune and have the hot end at the highest possible usable temp?

AndThenSome09 wrote:Yeah, I just found by way of searching through the configuration.h file that I needed to change the EXT0_TEMPSENSOR_TYPE from 97 to 8 since the new E3D comes with a Semitec thermistor.

Should I change the PID max temp so I can use PID auto tune and have the hot end at the highest possible usable temp?

Are you sure about the sensor type in firmware. I have read dozens of E3D installs and none of them including Cope413 had to edit the firmware.
Don't know about the PID max temp hopefully someone like Cope413 is reading this and could answer that.

Well I had to change the thermistor type, the max temp, and also the defective max temp. The defective max temp was giving me the problem, it was at like 275, I tried setting it to 300 but still got the lock out and the "def" message on the LCD because it doesn't stop right at temp, it overshoots it then goes back down. So I then set it to 380 a number I know it won't go to shooting for 300 and it worked then. Apparently the defective max temp is to be set to a number higher than your sensor can sense so if it reads that or above the firmware thinks something is wrong with the thermistor and disables everything putting the machine into dry mode until the next reset.

Maybe this is something new with the new firmware, I upgraded to the newest Repetier last week.

IDK but everything is working and printing beautifully now my friends! Thanks for the help!

AndThenSome09 wrote:Well I had to change the thermistor type, the max temp, and also the defective max temp. The defective max temp was giving me the problem, it was at like 275, I tried setting it to 300 but still got the lock out and the "def" message on the LCD because it doesn't stop right at temp, it overshoots it then goes back down. So I then set it to 380 a number I know it won't go to shooting for 300 and it worked then. Apparently the defective max temp is to be set to a number higher than your sensor can sense so if it reads that or above the firmware thinks something is wrong with the thermistor and disables everything putting the machine into dry mode until the next reset.

Maybe this is something new with the new firmware, I upgraded to the newest Repetier last week.

IDK but everything is working and printing beautifully now my friends! Thanks for the help!

You had to change EXT0_TEMPSENSOR_TYPE from 97 to 8.
Have you verified the reported temps with a thermocouple to be sure they are accurate?
Good job in figuring out what what was necessary to get everything working and leaving
us with the results. That's how we all learn.

Yes I changed EXT0_TEMPSENSOR_TYPE from 97 to 8, I dont have a thermocouple to test it with but I know at room temp it reads about the same as the heated bed and also in the comments it says 8 is for the Semitech thermistor which comes with the new E3D hot end so I'm pretty confident it is correct.

I ended up using Pilot 626s mount for the E3D but instead of the printed spacers I went to my local hardware store and found some "Tension Pins" which work wonderfully as a spacer and it looks cool too with a kinda grey metal color to it.

I gotta say the E3D all metal hot end is a marvelous piece of work and it works so well!!!

I just installed a new E3D v5 as well, but the manual I had said it was an EPCOS...I still ended up tweaking a couple of small values in the TYPE 97 thermistor table (the EPCOS' specs were available commented in the thermistor table -- I also verified the commented specs were correct.)

Where did you get the info about it being a Semitec? I'd like to know if mine really is as well!
Thanks!
-Daniel

Look on YouTube search for E3D thermistor and you'll see a video from E3D themselves talking about the switch.