i have a strange issue while printing. After 1-2h of printing time, my temperature drops below the melt point.
Normally my printer prints the most beautifull about 170°c. So since the last days, after about 1-2h of printing time, the temperature falls below 150°c, resulting in a to low temperature to extrude fillament.
The cooling runs on the same speed all time. I can’t imagine what causes this issue. Can anybody help me?
Thanks!
///EDIT:
Solution is on page 1, post #15.
Thanks again!
//EDIT 2:
Problem showed off again, did the same steps but this time it literally destroyed my whole Printhead.
See on post #25
Do you have 1 or 2 printheads? If you have 2 does it do the same on both heads or you have just one? My gut feeling tells me it is a termistor issue. Hense i was going to sugest to try if you had 2 heads and not the same issue on the other and move it from the working one to the one where you have the issue. That way test if it is the termistor or something before it in the curcuit. Could be that the Termistor over time in heat get problems to maintain the reistance. PS if you can try this remember to switch firmware to the 1 head or put the faulty termistor on the second head or you will get a min error.
Thank you for your reply. No i just have one printhead, and no spareparts
[quote=“biscuitlad”]What do the temperature graphs show? If you look at the history, once the temperature drops, is it constant or erratic?
If it’s erratic, my guess is that it’s just a loose wire going into the green connectors on the print head. I’d check those are all good.[/quote]
Thank you, too for the reply.
First i noticed that it takes a lot longer then before to heat up. About 5 minutes to 190°c, thats very long. Any ideas why?
Until now i didn’t printed from my PC, only from SD Card, so i couldn’t get a chance to look at the graph, but i just started a print with active monitoring!
But i did some screenshots from the heating process. That looks very irregular to me. Maybe you guys cane see something…
But i checked every cable and wire, everything sits tight!
[quote=“Wrong Way”]If I’m not mistaken 170C is right at the cold extrusion point.
You may want to bring it up to 175C to allow for temp dips.[/quote]
Also thank you for your help! Cold extrusion (i didn’t knew that before, thank you!) was the problem. The temperature falls below something ~150°c and the protect function Cold extrusion stops the extruder. Thats right, but the problem is, that the temperature falls below the target by ~20°c.
Is there some kind of draft or wind blowing on the printer?
I had that problem and put some cardboard in the vent (wife was not happy)
You should check the the connections for the heater and the thermistor make sure the screws are tight
[quote=“Wrong Way”]Is there some kind of draft or wind blowing on the printer?
I had that problem and put some cardboard in the vent (wife was not happy)
You should check the the connections for the heater and the thermistor make sure the screws are tight[/quote]
Thanks for your ideas.
No not really. No airflow, except for the Fans, but they run on 100% as i did hundreds of print hours perfectly fine.
Yes good point, but i checked every screw on the headmainboard and also the Pin connectors on the “main” mainboard.
You did say that it was taking longer to heat up.
Do this at your own risk.
Maybe put the printer on it’s back and turn the heater on for the extruder.
The only other thing I can think of is run some extension wires from the power supply out to a meter.
Do not let them short out
my test print stopped after about two hours. Here you can see the temp graph. It is perfectly fine for two hours, when suddenly it can’t hold the temp anymore at the same level.
[quote=“Wrong Way”]You did say that it was taking longer to heat up.
Do this at your own risk.
Maybe put the printer on it’s back and turn the heater on for the extruder.
The only other thing I can think of is run some extension wires from the power supply out to a meter.
Do not let them short out[/quote]
[quote=“Wrong Way”]You did say that it was taking longer to heat up.
Do this at your own risk.
Maybe put the printer on it’s back and turn the heater on for the extruder.
The only other thing I can think of is run some extension wires from the power supply out to a meter.
Do not let them short out[/quote]
OK! I did it. From 20-155°c it was at normal speed, 14.9-15v from the power supply.
From 155 it stops heating, holding the level, a little more a little less, see picture. 14.9-15v from the power supply.
Didn’t really get the 190°c… (if i wait long enough it reaches the 190° and holds it for about 2h…)
You could try tuning the PID parameter. The goal is to stabilize the temperature curve.
Here’s a how to :
Connect your printer to Repetier
Go to the “Manual control” tab
Key in M303 S190 C5 in the G-Code text-box then press Send.
M303 = PID auto calibrate
S190 = set the temperature to 190C
C5 = do 5 iterations
In the log you will see “PID Autotune start” when the first iteration begins
After each iteration you’ll get the results in the log window as below.
Kp: 26.42
Ki: 1.14
Kd: 153.24
Take the values from the last iteration and copy them in the EEPROM settings (Config tab/Firmware EEPROM configuration)
[quote=“tuxx”]is it possible, that this parameters change from one day to another?
[/quote]
Normally no but there can be a glitch in the specs of some components.
