I've been struggling with this printer since late summer. I have had spurts where I threw up my hands and left it sitting for weeks. It's been one thing after another, but I finally have everything doing something similar to what it is supposed to. I started with a Hictop Prusa i3 kit. Since then, the controller board was faulty at first, replacement blew up because of my stupidity and took a month to get here from China, so I replaced it with a MiniRambo. I replaced all of the motors, the power supply, and the hot end thermistor. The common problem had been runaway temps without shutting down. So i messed up alot of nozzles along the way as well. I could not get autotune to run as it would fail with max temp, but it did at least shut down the hot end.

I finally got autotune to work by changing PID_MAX to 60.

Then I tried to print a 20mm cube. Started off pretty good, then I got a Thermal Runaway error and it stopped printing.

What I don't understand is that the temperature according to the logs was pretty constant. It does appear that the filament was doing something strange since one side of the cube looked like it had a big glob of filament instead of smooth lines. Also, it looks like some came through around the outside of the nozzle.

Pictures and the last portion of the log is below. At this point, I'm at a complete loss. The temperature graph was super consistent for the short time it was printing and had by no means started to "runaway". Normally I would just ask the Google, but I'm apparently not using the proper search terms as Google is failing me or I don't understand what I'm reading. If someone can point me in the right direction, I'd be extremely grateful.

Not sure what info would be helpful, so I took a guess that this would help:
Firmware: Marlin 1.0.2
Power Supply: Output = +24V 50/60Hz 20A
Values from Autotune:
// PID Autotune
#define DEFAULT_Kp 4.07
#define DEFAULT_Ki .17
#define DEFAULT_Kd 23.63
Thermal Runaway Settings:
#define THERMAL_RUNAWAY_PROTECTION_START_PERIOD 20
#define THERMAL_RUNAWAY_PROTECTION_PERIOD 20 //in seconds
#define THERMAL_RUNAWAY_PROTECTION_HYSTERESIS 4 // in degree Celsius

20160109_152238.jpg"glob" is on bottom side of cube
20160109_152245.jpg"glob" is on right side of cube
20160109_152310.jpgFor some reason, pic is upside down, but glob of filament is partially obscuring the brass color of the nozzle on "top" of the aluminum block.

From the log:
Send: N381 M105*45
Recv: ok T:190.2 /200.0 B:0.0 /0.0 T0:190.2 /200.0 @:30 B@:0
Send: N382 G1 X90.250 Y109.750 E12.14959 F1800.000*29
Recv: ok
Send: N383 G1 X90.250 Y90.250 E12.51012*94
Recv: ok
Send: N384 G1 X109.750 Y90.250 E12.87064*103
Recv: ok
Send: N385 G1 X109.750 Y109.675 E13.22977*81
Recv: ok
Send: N386 G1 X109.317 Y109.500 F7800.000*83
Recv: ok
Send: N387 G1 Z2.450 F7800.000*4
Recv: ok
Send: N388 G1 X109.250 Y109.250 F7800.000*93
Recv: ok
Send: N389 G1 X90.750 Y109.250 E13.57180 F1800.000*28
Recv: ok
Send: N390 G1 X90.750 Y90.750 E13.91384*93
Recv: ok
Send: N391 G1 X109.250 Y90.750 E14.25587*101
Recv: ok
Send: N392 G1 X109.250 Y109.175 E14.59652*86
Recv: ok
Send: N393 G1 X109.250 Y109.750 F7800.000*82
Recv: ok
Send: N394 G1 X109.750 Y109.750 F7800.000*80
Recv: ok
Send: N395 M105*40
Recv: ok T:191.7 /200.0 B:0.0 /0.0 T0:191.7 /200.0 @:27 B@:0
Send: N396 G1 X90.250 Y109.750 E14.95704 F1800.000*17
Recv: ok
Send: N397 G1 X90.250 Y90.250 E15.31756*93
Recv: ok
Send: N398 G1 X109.750 Y90.250 E15.67808*97
Recv: ok
Send: N399 G1 X109.750 Y109.675 E16.03721*87
Recv: ok
Send: N400 G1 X109.317 Y109.500 F7800.000*90
Recv: ok
Send: N401 G1 Z2.750 F7800.000*14
Recv: ok
Send: N402 G1 X109.250 Y109.250 F7800.000*88
Recv: ok
Send: N403 G1 X90.750 Y109.250 E16.37925 F1800.000*29
Recv: ok
Send: N404 G1 X90.750 Y90.750 E16.72128*91
Recv: ok
Send: N405 G1 X109.250 Y90.750 E17.06331*102
Recv: ok
Send: N406 G1 X109.250 Y109.175 E17.40396*90
Recv: ok
Send: N407 G1 X109.250 Y109.750 F7800.000*88
Recv: ok
Send: N408 M105*43
Recv: ok T:193.6 /200.0 B:0.0 /0.0 T0:193.6 /200.0 @:24 B@:0
Send: N409 G1 X109.750 Y109.750 F7800.000*83
Recv: ok
Send: N410 G1 X90.250 Y109.750 E17.76448 F1800.000*29
Recv: ok
Send: N411 G1 X90.250 Y90.250 E18.12500*89
Recv: ok
Send: N412 G1 X109.750 Y90.250 E18.48552*102
Recv: ok
Send: N413 G1 X109.750 Y109.675 E18.84466*83
Recv: ok
Send: N414 G1 X109.317 Y109.500 F7800.000*95
Recv: Error:Thermal Runaway, system stopped! Heater_ID:
Changing monitoring state from 'Printing' to 'Error: Thermal Runaway, system stopped! Heater_ID:
'
Recv: 0