Solved Programs think hot end is heated when it isn't

PLA
190 degree hot end
60 degree bed temp
Initial Layer .3mm
Initial Layer Line Width 100
Travel Speed 150.0 mm/s
Bottom/top thickness 3mm
Diameter 1.75
Flow 100%
Nozzle Size 0.4mm

I am using Cura and MatterControl and both of the programs think that my printer is 350 degrees when it isn't even warm. Because of this it won't warm up at all meaning I can't print. Possible reasons this could be happening? I thought it might be an issue with the motherboard, but wanted to run it by the forum before I just buy a new motherboard.

I put this printer down about a year ago because it was nothing but issues. Please let me know if there is any more info you need. I bout a robo 3d R1 refurbished, but when it came it had all the bells and whistles of the R1+. Still not sure which one I have.

Also, I think this temperature issue started when i replaced the hot end. Maybe I connected something inappropriately? Let me know your thoughts.

 

Fair enough. Do either of you have any guides or useful videos that might show me how to check/replace any of these? The thermistor is on the hot end itself usually, right?

If I buy an entire new hotend do either of you have suggestions?

 

I unfortunately don't fully understand what you are saying here.

 

Got it, so most likely a dead short circuit. In this case should I just buy another new hot end? I think the thermistor on the one I got was glued into a hole and I doubt I could get it out. Do you have any suggestions? The last one I bought may have just been the cheapest one on amazon or something. It has been a while.

 

I messed up a print, and it somehow caught the thermistor wire and pulled it loose. I had to ask Robo for a replacement thermistor(Free with warranty, except shipping), which I got within a week, and I used this: https://www.amazon.com/Permatex-80335-Muffler-Tailpipe-Sealer/dp/B000BOAZM8 (except I found it at an auto parts store in my town, and my town is small) to hold it in place. It has a resistance of 2000 degrees F.(That is just under 1100 C).

My point is, is that even if it is the thermistor itself, and not the wiring, its not a gigantic huge mess.

Good luck!
-Eric

 

I am starting to doubt that I bought a new one. I checked my amazon history and didn't find anything. I wonder if I bought the stock robo 3d r1 hot end form a different site. Either way I think it should be the stock part. I will have to check after work.

 

Thank you. I will take this into account, but I know very little about any of this part of 3d printing (Thermistors and what not) so hopefully I don't break anything else in the process.

 

Alright...here is my extruder. When I disconnect the padded red wires the temperature drops down to 0 degrees C. I tried swapping the red padded wire connections with the red and black connections and the thermometer worked, but it started skyrocketing in temperature, and started smoking, so I swapped them back and I am now stuck at 357.5 degrees again. So...What am I checking here? Am I checking the wires that lead into the extruder? Am I checking the motherboard?

 

So this is the only thing that looks suspect to me. One of the metal bits seems to be shorter than the other. Sorry for the poor picture, the camera was trying to focus on my fingers. : (

 

Here is the thermistor connected to the arduino board. Based on a diagram I pulled from a thread that Mark Tomlinson posted it appears they are in the right place...

 

What do you mean what temp do I show cold? I have not heated the printer up, it says 357 degrees, and it won't actually heat up because it thinks it is at 357 degrees

 

Here is the connection to the hot end itself

 

Now that I look at it, is the connection in the hotend where the black wires are leading to not in all the way? It almost looks like it is sticking out a bit far