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threedee

Stop after few minutes printing - MINTEMP

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Having bought my kit about a year ago and assembling it without problems and running it successfully since, I am suddenly in a new situation: Every time I start a print it will go normal for a few minutes and then suddenly the set temperature drops from 220 to 0 degrees and the printing aborts.

I've done the following changes between sucessful printing and the new situation:

 

  1. Updated the firmware
  2. Updated Cura to 13.10 and then to 13.11
  3. Gone back to 13.03

There is no differnce between running directly from my PC or from the Controller.

Below I've printed the error log. I can see something is happening, but I have no idea what is causing it. Any of you out there being able to help me?

Error log

Send: N6770G1 X76.939 Y119.038*15

Recv: ok

Send: N6771G1 X62.892 Y105.884 F4500.0*112

Recv: ok

Send: N6772G1 X76.724 Y119.716 F1500.0 E260.0669*14

Recv: ok

Send: N6773G1 X76.725 Y120.283 E260.0743*120

Recv: ok

Send: N6774G1 X70.922 Y114.48 E260.1809*66

Recv: ok

Send: N6775G1 X70.922 Y115.046 E260.1882*127

Recv: ok

Send: N6776G1 X76.725 Y120.849 E260.2949*119

Recv: ok

Send: N6777G1 X76.724 Y119.15 F4500.0*76

Recv: ok

Send: N6778G1 X64.234 Y106.661 F1500.0 E260.5243*5

Recv: ok

Send: N6779G1 X65.577 Y107.438 F4500.0*112

Recv: ok

Send: N6780G1 X75.384 Y117.244 F1500.0 E260.7045*13

Recv: ok

Send: N6781G1 X74.448 Y115.743 F4500.0*118

Recv: ok

Send: N6782G1 X66.919 Y108.215 F1500.0 E260.8428*9

Recv: ok

Send: N6783G1 X68.262 Y108.992 F4500.0*121

Recv: ok

Send: M105

Recv: ok T:220.5 /220.0 B:0.0 /0.0 @:37 B@:0

Send: N6784G1 X73.675 Y114.404 F1500.0 E260.9423*15

Recv: ok

Send: N6785G1 X73.096 Y113.26 F4500.0*64

Recv: ok

Send: N6786G1 X69.605 Y109.769 F1500.0 E261.0064*10

Recv: ok

Send: N6787G1 X70.948 Y110.546 F4500.0*123

Recv: ok

Send: N6788G1 X72.631 Y112.229 F1500.0 E261.0374*0

Recv: ok

Send: N6789G1 X62.12 Y109.072 F4500.0*74

Recv: ok

Send: N6790G1 X53.493 Y100.445 F1500.0 E261.1959*11

Recv: ok

Send: N6791G1 X54.836 Y101.222 F4500.0*119

Recv: ok

Send: N6792G1 X63.462 Y109.848 F1500.0 E261.3544*14

Recv: ok

Send: N6793G1 X64.803 Y110.624 E261.3745*112

Recv: ok

Send: N6794G1 X56.178 Y101.999 E261.533*74

Recv: ok

Send: N6795G1 X57.521 Y102.776 F4500.0*124

Recv: ok

Send: N6796G1 X66.145 Y111.4 F1500.0 E261.6915*11

Recv: ok

Send: N6797G1 X67.487 Y112.176 E261.7116*113

Recv: ok

Send: N6798G1 X58.864 Y103.553 E261.8701*127

Recv: ok

Send: N6799G1 X60.206 Y104.33 F4500.0*70

Recv: ok

Send: N6800G1 X68.828 Y112.952 F1500.0 E262.0285*9

Recv: ok

Send: N6801G1 X70.17 Y113.728 E262.0486*78

Recv: ok

Send: N6802G1 X61.549 Y105.107 E262.207*64

Recv: ok

Send: N6803G1 X70.583 Y114.359 F9000.0*119

Recv: ok

Send: N6804G1 X73.232 Y118.655*10

Recv: ok

Send: N6805G1 X77.087 Y142.17*60

Recv: ok

Send: N6806G1 X99.842 Y134.321*9

Recv: ok

Send: M105

Recv: ok T:220.4 /220.0 B:0.0 /0.0 @:33 B@:0

Send: N6807G1 X100.577 Y134.743*50

Recv: ok

Send: N6808G1 X99.842 Y147.022*3

Recv: ok

Send: N6809G1 X100.577 Y147.445*61

Recv: ok

Send: N6810G1 X99.843 Y159.724*5

Recv: ok

Send: N6811G1 X100.577 Y160.147*54

Recv: ok

Send: N6812G1 X100.6 Y167.572*51

Recv: ok

Send: N6813G1 X94.15 Y171.529*53

Recv: ok

Send: N6814G1 X101.415 Y186.482 F4500.0*74

Recv: ok

Send: N6815G1 X100.728 Y187.091 F1500.0 E262.2189*58

Recv: ok

Send: N6816G1 X100.348 Y187.926 E262.2309*72

Recv: ok

Send: N6817G1 X100.341 Y188.843 E262.2428*73

Recv: ok

Send: N6818G1 X100.709 Y189.683 E262.2547*69

Recv: ok

Send: N6819G1 X101.386 Y190.302 E262.2666*66

Recv: ok

Send: N6820G1 X102.257 Y190.59 E262.2785*119

Recv: ok

Send: N6821G1 X103.171 Y190.5 E262.2905*79

Recv: ok

Send: N6822G1 X103.972 Y190.041 E262.3024*76

Recv: ok

Send: N6823G1 X104.517 Y189.289 E262.3145*77

Recv: ok

Send: N6824G1 X104.703 Y188.378 E262.3266*65

Recv: ok

Send: N6825G1 X104.501 Y187.481 E262.3385*66

Recv: ok

Send: N6826G1 X103.994 Y186.783 E262.3498*77

Recv: ok

Send: N6827G1 X103.204 Y186.313 E262.3617*70

Recv: ok

Send: N6828G1 X102.291 Y186.207 E262.3736*66

Recv: ok

Send: N6829G1 X101.415 Y186.482 E262.3856*72

Recv: ok

Send: N6830G1 X101.214 Y186.126 F4500.0*64

Recv: ok

Send: N6831G1 X100.399 Y186.848 F1500.0 E262.3997*57

Recv: ok

Send: N6832G1 X99.949 Y187.838 E262.4138*124

Recv: ok

Send: N6833G1 X99.941 Y188.925 E262.428*71

Recv: ok

Send: N6834G1 X100.376 Y189.922 E262.4421*68

Recv: ok

Send: N6835G1 X101.179 Y190.655 E262.4562*72

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6836G1 X102.212 Y190.997 E262.4704*69

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6837G1 X103.296 Y190.889 E262.4845*77

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6838G1 X104.245 Y190.346 E262.4987*76

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6839G1 X104.892 Y189.454 E262.513*116

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6840G1 X105.112 Y188.374 E262.5273*74

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6841G1 X104.873 Y187.312 E262.5415*77

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6842G1 X104.269 Y186.481 E262.5548*74

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6843G1 X103.335 Y185.925 E262.569*114

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6844G1 X102.252 Y185.8 E262.5831*71

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6845G1 X101.214 Y186.126 E262.5973*78

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6846G1 X101.214 Y180.551 F4500.0*67

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6847G1 X105.331 Y180.551 F1500.0 E262.6507*60

Recv: ok

Send: N6848G1 X111.029 Y180.153 E262.725*114

Recv: echo: cold extrusion prevented

Recv: ok

Send: M105

Recv: echo: cold extrusion prevented

Recv: ok T:50.1 /220.0 B:0.0 /0.0 @:128 B@:0

Send: N6849G1 X116.67 Y179.361 E262.799*76

Recv: ok

Send: N6850G1 X122.241 Y178.177 E262.873*122

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6851G1 X127.716 Y176.607 E262.947*113

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6852G1 X133.068 Y174.659 E263.021*120

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6853G1 X138.271 Y172.342 E263.095*126

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6854G1 X143.3 Y169.668 E263.169*119

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6855G1 X148.13 Y166.65 E263.243*115

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6856G1 X152.738 Y163.302 E263.317*114

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6857G1 X157.101 Y159.641 E263.391*127

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6858G1 X161.198 Y155.684 E263.465*124

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6859G1 X165.01 Y151.452 E263.539*77

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6860G1 X168.516 Y146.964 E263.613*124

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6861G1 X171.701 Y142.242 E263.687*119

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6862G1 X174.549 Y137.309 E263.761*122

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6863G1 X177.046 Y132.19 E263.835*75

Recv: ok

Send: N6864G1 X179.179 Y126.909 E263.909*124

Recv: ok

Send: N6865G1 X180.939 Y121.492 E263.983*125

Recv: ok

Send: N6866G1 X182.317 Y115.966 E264.057*124

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6867G1 X183.306 Y110.357 E264.131*112

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6868G1 X183.902 Y104.692 E264.2049*68

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6869G1 X184.1 Y99.0 E264.2789*123

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6870G1 X183.902 Y93.308 E264.3529*118

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6871G1 X183.306 Y87.643 E264.4269*114

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6872G1 X182.317 Y82.034 E264.5009*118

Recv: echo: cold extrusion prevented

Recv: ok

Send: N6873G1 X180.939 Y76.508 E264.5749*113

Recv: Error:0

Recv: : Extruder switched off. MINTEMP triggered !

Changing monitoring state from 'Printing' to 'Error: 0: Extruder switched...'

Recv: Error:Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)

Recv: echo: cold extrusion prevented

Recv: Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)

Recv: ok

Recv: echo:enqueing "G28"

Recv: ok

 

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Check that the thermocouple wires are firmly attached to the board in the head. Also that the two wires from that board to the electronics are properly attached. If no obvious problems check continuity on the latter two wires, if you can - they may be broken. There's a spare pair of wires and connector intended for second extruder - try swapping in that one (remember to change both ends) for the original.

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The log doesn't help much. MINTEMP and MAXTEMP are indicators that something is wrong with the temperature reading. This can be serious as if the values reported back are wrong in the low direction, the Marlin would normally add more heat to get it to the correct temperature but this could bring the heater up to 250C and damage/melt your PEEK part (the brown plastic).

The most common error for a 1 year old UM is that due to printing, the wires have been moving around a lot as you print. Now they may be damaged. Usually near the print head. Usually inside the connector.

But there are other possibilities - the small circuit board on the print head can go bad also. Also the fan cable signal can interfere with the temperature reading - especially if you are not at 100% or 0% fan speed (speeds in between turn the fan on and off very fast). So make sure the heater wire is an inch or so away from the temp probe wires before they get to the amplifier board (between the aluminum block and the tiny amp board.

Also your heater itself may have stopped working.

Some things to try - heat your head up to 95C and test with water on a q-tip or similar (or water on a finger) to make sure it doesn't boil at 95C and *does* around 105 to 110C.

Move the print head to the 4 corners of your print area while the head is hot - leave the head in each corner for a second. See if this tugging on the wires generates MINTEMP or MAXTEMP. You don't need to be printing to get these errors - simply having the head set to 180C and then a wiring fault will trigger this and display it on the Ulticontroller. If you don't have an Ulticontroller then I don't know how to test for this - I guess you could print just the skirt of something that just barely fits in the platform.

 

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I'm back in house and have gone through my printer. Measured continuity, checked connections, measured temperature wiggled heater and the thermocouple.

Moving the print head about and checking connections did not give any results.

Could not find any problems.

It may have been a bad connection, electrical interference, earlier Cura models not being compatible....

Started printer and all is well - have printed several different prints and they run through to the end and turn out normal.

Great relief and great frustration not to know what really happened. For the time being I settle for bad connection in screw connector on top of printing head - most probable I think.

I learned one thing though, the temperature measured is about 6% off the real temperature of the Al head/nozzle.

Thanks for your suggestions.

 

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Glad you got it working. I also found that measured independently, the outside of my heater block was about 5% off from the reported temperature. Not sure if that's defect per se, or just the way it is.

The only time I've really found it to matter is when printing PA6 Nylon which is a bit picky about the temperature in order to avoid delamination. I had to set my temperature correspondingly higher than their recommended 265º to get good prints.

 

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