Printer hotend temperature lower than indicated and causing jams and under extrusion
 

Printer hotend temperature lower than indicated and causing jams and under extrusion  

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lcemoore
(@lcemoore)
Active Member

The problem,  

print jobs fail due to extreme under extrusion or nozzle jams.

I have disassembled the extruder, cleaned everything and replaced the PEFT tube and nozzle. Reinstalled it all with proper clearances and thermal paste IAW the prusa guide. Tried printing, this is what I found.

PLA will not print efficiently with any temperature below an indicated temperature 240C. 

PETG will not print correctly below and indicated temperature of 260C

This is 25C higher than those I've used for over 2 years.

Anyone know why this would happen?

I have printed two projects at these higher temperature with no problems, but I'm concerted the temperature error will continue to be a problem.

Anyone have any ideas?

 

 
     

nd temperatue below 240C.  PETG 

Posted : 20/07/2020 2:56 am
Karl Herbert
(@karl-herbert)
Famed Member
Posted by: @lcemoore

The problem,  

print jobs fail due to extreme under extrusion or nozzle jams.

I have disassembled the extruder, cleaned everything and replaced the PEFT tube and nozzle. Reinstalled it all with proper clearances and thermal paste IAW the prusa guide. Tried printing, this is what I found.

PLA will not print efficiently with any temperature below an indicated temperature 240C. 

PETG will not print correctly below and indicated temperature of 260C

This is 25C higher than those I've used for over 2 years.

Anyone know why this would happen?

I have printed two projects at these higher temperature with no problems, but I'm concerted the temperature error will continue to be a problem.

Anyone have any ideas?

 

 
     

nd temperatue below 240C.  PETG 

Do you use the original E3D hotend with brass nozzle? You might want to check the thermistor. It should have an internal resistance of 100k ohms at an ambient temperature of 25 degrees C.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 20/07/2020 8:40 am
lcemoore
(@lcemoore)
Active Member

@karl-herbert

I have the original hotend supplied from Prusa, except for the nozzle which I've replaced multiple times.

I haven't checked the thermistor resistance at 25c because when it is cold the hot-end and bed temperatures on the display are the same. This morning they both read 26C.  But I will, just for the data point

I thought maybe some temperature offset was being enforced by software. My last printer had a setting to offset temperature(don't know why), but I couldn't find any setting in the slicer or on the printer menu to do this.

 

Posted : 20/07/2020 12:37 pm
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