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Ultimaker / Cura

3D printer / slicing GUI built on top of the Uranium framework
GNU Lesser General Public License v3.0
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Printing temperature drops to under 180 celcius #3796

Closed nickzomp1 closed 6 years ago

nickzomp1 commented 6 years ago

Application Version Ultimaker Cura 3.3.1

Platform Windows 10 64-Bit

Printer FLSUN Klossl Delta

Steps to Reproduce Load STL file into Cura to generate GCODE file. Set printing temperature to 220 celcius. GCODE file is then loaded into Repetier-Host (which I connect my printer to) to print.

Actual Results Printing temperature starts out at 220 celcius then drops to about 170-180 celcius (no matter what I set printing temperature to). Also at these temperature the feeder motor stops at times, then restarts at random.

Expected results Printer should print at ~220 Celcius and feeder motor should not stop throughout print

Additional Information I've noticed this happening recently on my prints. The temperature will drop to under 180 Celcius (PLA printing) and the feeder motor will stop running. I think this is because the heating element is not hot enough to melt the PLA filament, thus the feeder motor stops, but am not sure. Has anyone else had this problem?

smartavionics commented 6 years ago

Please attach a typical gcode file so that I can check the temperature changes. Thanks.

nickzomp1 commented 6 years ago

Here's the last two files I've run, both with temperature issues (uploaded as .txt files):

KM_CaddyRack2.txt KM_Gray Slaad for Shapeways.txt

smartavionics commented 6 years ago

As there are no gcodes in your files that alter the temp after the initial setting it must be something that is causing the hotend to cool. I notice that you are using 6.5mm of retraction. I don't know what extruder and hot end you are using but on my own Kossel Mini that is using an e3d Titan extruder and v6 hotend I am only using 4mm of retraction and don't get any stringing. It could be that you are over-retracting which could do 2 things that would decrease the nozzle temp (1) it will pull relatively cold air into the nozzle and (2) it will pull the filament out of the hot zone into the cold zone for the duration of the travel move. Another bad effect of over-retraction is that it causes "zits" to appear in random places on the print. I think those are caused by the air that is sucked into the nozzle forming bubbles which get expelled some random time later. So, try using less retraction and see what happens. One other thing, maybe you need a higher wattage heater in your hot end? You could try slowing down the print speeds and if the temp stays high then it's probably the heater not giving enough heat to keep up the flow rate required to print at the speeds you are using. Hope this helps!

smartavionics commented 6 years ago

Other thoughts are that the part cooling fan is blowing on the hotend too much and cooling it and also that the power supply may not be powerful enough to sustain the correct voltage when the steppers are moving and so the hotend heater isn't getting all the power it needs.

AbeFM commented 6 years ago

Does the extruder strip filament, or just so turning at all?

Odds are the stop is a firmware preventing of extrusion - some firmwares even report such to a serial monitor.

Perhaps your thermocouple is loose, not seeing the hot end temperature (filament wouldn't strip, it will ooze and may burn of printer gets too hot.). Heater could be loose, too, in head, or it's connection/wiring could be bad.

I would check all that, poorly controlled heaters can cause fires.

Lastly, power supply as suggested above, and consider a silicone boot for the heater block a la e3D.

BagelOrb commented 6 years ago

Oh wait. It's not in the gcode so it's not Cura which is at fault.