Its not possible to resume a print that fail halfway unless you know how to manipulate the gcode of the file.

I have problems like this before and it depends on a few factors.

You might want to check your power supply and the cable.connecting to the printer, I had a problem once where the power supply shorted internally and had to open the sealed laptop case to fix the problem. Another is to see if any of the power supply wire is melting. I had a power supply wire barrel plug melted a little and the wires inside was slightly burnt.

Another issue is due to the usb communication, make sure to use a cable as short as possible to avoid any data loss. USB supplies 5 volts so their voltage drop a tremendously over long distance. A 1 meter cable will have more data loss than a 10 cm cable. Also winding a long cable around a ferrite core helps in reducing noise.

Also, if you think your house have electrical issues, you might want to invest in a uninterruptable power supply, UPS unit. At least the backup battery will sort out any micro power interruptions and also keep your printed running during a black out.

If you like I can meet up for the exchange, I currently have a brand new J-head, which I have yet use but plan on using it for ABS filament. I am currently upgrading my printer for ABS support.

The grub screw leak sounds menacing but I am up for a challenge.

If you are interested, let me know by PM.

I was not planning to print ABS at all actually, Just heating the hotend to get it melt my PLA , the arrow show where some plastic leaked out, I haven't really got the chance to dissemble it yet from my printer, from the picture also you can see the thermistor location is badly placed from my point of view

I'll sent you PM

Isnt that where the grub screws go in? If the grubscrew fits snugly, there shouldnt be any leakage.

Thanks for the insight bro altan.

Hmmm... You suggest that it might be a problem with the power supply? Guess i will need to do something about that soon. If you are right then that should also explain the mysterious problem i have with my overheating mosfet. Never knew that a long usb cable will be an issue too. Time for me to switch back to the stock short cable.

By the way, my lcd controller just came in today. Can i just plug it in and use it straight away?

Thanks again guys!

I was not planning to print ABS at all actually, Just heating the hotend to get it melt my PLA , the arrow show where some plastic leaked out, I haven't really got the chance to dissemble it yet from my printer, from the picture also you can see the thermistor location is badly placed from my point of view

I'll sent you PM

Depends if your firmware has been preconfigured to have LCD enabled, then its just plug and play. If not you might have to change a few variables in the firmware to get it to work.
I was wondering, what is the purpose of grub screw hole?

I'm gussing to hold the nozzle and cold end tight like those Z rod coupler do

the second one which why having the grub screw does not make sense to me as it will damages the thread for both nozzle and heat break

Morning guys!

Anyone know how i can remove this blue dial cover? Printed a casing for my led controller but i need to remove the dial in order for me to fit it in.

Thanks in advance.

That really doesn't make any sense... 

just pull it out, I printed mine a new knob did not use the original one
I just did a clean up with a blow torch same results I even swapped thermistor location does not make any different

Pull it out with brute strength? Or better still will try to pry it out gently instead. Got to try it once im back at home. Thank you.

be gentle  , the knob just push fitted nothing is holding it just friction, use a screw driver slide under it to center of the screw driver and slowly push your screw driver upward, be careful not to damage the pcb board

Success! Now i wont have to leave my pc on during long hours of printing session. Come to think about it, i should learn some proper way to calibrate my printer. Can someone recommend some good article on the subject?

Thanks in advance.

good place to start!, by the way remove the paper covering the buzzer

http://reprap.org/wiki/Calibration