extruder not work correctly

[searider19]

Hi,

I have a problem with overheating of extruder on my Geetech Prusa I3 Pro B. The thermistor shows temperature correctly, but when I want to print something (for example I set temp to 200 °C) the temperature never stops until it reaches a MAX temperature 270 °C. And strange I got this error on LCD and Repetier on Win, but heater in extruder didn't stop heating. Is this firmware problem? I uploaded latest firmware with correction for X axis direction.

Best regards, Gregor

[Admin]

what is the temprature you set in printer settting in repetier host?

[virtika]

I also have this issue with a recently built Geeetech Acrylic i3 Pro B, have sucessfully completed one print without any issues (using the Maker Faire Robot as a test print), but on attempting a second print the extruder continually heated up past the set temperature (200degC) until it reached the limit of 270deg and shut off with "Err: MAXTEMP" message on LCD and in Repetier.

The thermistor on both the LCD and in Repetier both showed the same value of the temperature rising until it shut off and the printer is now happily showing room temperature for both heated bed and extruder thermistors now that the power has been shut off.

Any ideas?

[William]

I also have this issue with a recently built Geeetech Acrylic i3 Pro B, have sucessfully completed one print without any issues (using the Maker Faire Robot as a test print), but on attempting a second print the extruder continually heated up past the set temperature (200degC) until it reached the limit of 270deg and shut off with "Err: MAXTEMP" message on LCD and in Repetier.

The thermistor on both the LCD and in Repetier both showed the same value of the temperature rising until it shut off and the printer is now happily showing room temperature for both heated bed and extruder thermistors now that the power has been shut off.

Any ideas?

Hi,virtika
Try to check it like the following link:
http://www.geeetech.com/forum/viewtopic ... 23&t=17030

[virtika]

I also have this issue with a recently built Geeetech Acrylic i3 Pro B, have sucessfully completed one print without any issues (using the Maker Faire Robot as a test print), but on attempting a second print the extruder continually heated up past the set temperature (200degC) until it reached the limit of 270deg and shut off with "Err: MAXTEMP" message on LCD and in Repetier.

The thermistor on both the LCD and in Repetier both showed the same value of the temperature rising until it shut off and the printer is now happily showing room temperature for both heated bed and extruder thermistors now that the power has been shut off.

Any ideas?

Hi,virtika
Try to check it like the following link:
http://www.geeetech.com/forum/viewtopic ... 23&t=17030

I have checked the link and confirmed that the thermistors seem to be working fine, as is the hotend. Ran another 4.5hr print from Repetier/Slic3r yesterday and it completed without issue, holding a good consistent temperature of 200deg +/-5deg on bed/extruder throughout.

What I have noticed however, is that the problem seems to happen when the temperature is adjusted via the LCD/knob after a Repetier job has started. Once the new limit is set (say, changing from 200deg to 205deg), the temperature just keeps rising until it gets to 270 and shuts off. I believe this would point to a software/firmware issue perhaps..? Or maybe the temperature shouldn't be changed via the printer control if not printing from SD?

This is with the latest available firmware (that I could find at least). It's all a learning process, feel like i've been dunked in the deep end haha

[William]

I also have this issue with a recently built Geeetech Acrylic i3 Pro B, have sucessfully completed one print without any issues (using the Maker Faire Robot as a test print), but on attempting a second print the extruder continually heated up past the set temperature (200degC) until it reached the limit of 270deg and shut off with "Err: MAXTEMP" message on LCD and in Repetier.

The thermistor on both the LCD and in Repetier both showed the same value of the temperature rising until it shut off and the printer is now happily showing room temperature for both heated bed and extruder thermistors now that the power has been shut off.

Any ideas?

Hi,virtika
Try to check it like the following link:
http://www.geeetech.com/forum/viewtopic ... 23&t=17030

I have checked the link and confirmed that the thermistors seem to be working fine, as is the hotend. Ran another 4.5hr print from Repetier/Slic3r yesterday and it completed without issue, holding a good consistent temperature of 200deg +/-5deg on bed/extruder throughout.

What I have noticed however, is that the problem seems to happen when the temperature is adjusted via the LCD/knob after a Repetier job has started. Once the new limit is set (say, changing from 200deg to 205deg), the temperature just keeps rising until it gets to 270 and shuts off. I believe this would point to a software/firmware issue perhaps..? Or maybe the temperature shouldn't be changed via the printer control if not printing from SD?

This is with the latest available firmware (that I could find at least). It's all a learning process, feel like i've been dunked in the deep end haha

Yep，you are right in some way.Cuz the Repetier and the LCD control panel are both equal to a control center of the 3D printer,like a brain of human.In other words,they can work independently，but there will be an accident to the 3D printer if you wanna control them at the same time.

[virtika]

Ahh, awesome, that makes it an easy 'fix' for my problem haha - just don't change temp from printer when printing from PC & visa versa. Thanks for that, I had my suspicions but wanted to make sure.

[William]

Ahh, awesome, that makes it an easy 'fix' for my problem haha - just don't change temp from printer when printing from PC & visa versa. Thanks for that, I had my suspicions but wanted to make sure.

You are so smart!

[searider19]

Hi,

maybe some find useful tips from my story around extruder heating on Prusa I3 Pro B. At first turn on of printer, extruder turned on and go to 280°C (PTFE tube was damaged). Ok many suggested that check for MOSFET, but the mosfet was OK. I take another mosfet but extruder turned on on power on. So I figured out the problem was bad GT2560 board production around mosfets (bad lacquer protection). Small unprotected area under heatsink caused short between heatsink(mosfet TAB in this case it's DRAIN and it means 12V) and G-line passing directly under heatsink. So I had always open mosfet because of this short. This was the cause of my problems and maybe others have same problems but never pay attention to that. I think that this unprotected area a result of mounting heatsink to board (heatsinks have a very sharp edges). So I protected G-line simple with cd/dvd marker (use something not conducting) and I also remove lower edges of heatsinks, that G-line isn't anymore directly under heatsink. Another thing what I did was to remove original mosfets with better one, so now under full load the mosfets are cool.
I printed for 1 mont without problems and now another problem appeared (Y-axis misaligment).


Best regards.

[Toy]

Hi,

maybe some find useful tips from my story around extruder heating on Prusa I3 Pro B. At first turn on of printer, extruder turned on and go to 280°C (PTFE tube was damaged). Ok many suggested that check for MOSFET, but the mosfet was OK. I take another mosfet but extruder turned on on power on. So I figured out the problem was bad GT2560 board production around mosfets (bad lacquer protection). Small unprotected area under heatsink caused short between heatsink(mosfet TAB in this case it's DRAIN and it means 12V) and G-line passing directly under heatsink. So I had always open mosfet because of this short. This was the cause of my problems and maybe others have same problems but never pay attention to that. I think that this unprotected area a result of mounting heatsink to board (heatsinks have a very sharp edges). So I protected G-line simple with cd/dvd marker (use something not conducting) and I also remove lower edges of heatsinks, that G-line isn't anymore directly under heatsink. Another thing what I did was to remove original mosfets with better one, so now under full load the mosfets are cool.
I printed for 1 mont without problems and now another problem appeared (Y-axis misaligment).


Best regards.

Do you mean there's a shifting in Y-axis? then I think you need to check the belt, is it too loose or too tight?　And how about the pully or the bearings, are they all normal?