Hello guys. I am new to 3d printing. @D_Rob suggested this community to me. I have been having troubloes with extrusion with my 3d printer after 10-15min of printing the extrusion stops and extrudes then extrudes then stops like so please help i can print anything
Specs
Model: Prusa i2
Filament: 1.75mm
Hotend: 0.4mm J Hotend
Electronics: RAMPS 1.4
I would check the tension on your belt(x,y) , I think I can see a little slack in one of the pics. But for sure need to clean the bobbed bolt of all that ground in filament, which looks as if you need to ease off the pressure on your feed mechanism.
Have you got any active cooling (fan) running across the top of your hotend (through the cooling fins)?
@Daniel_Fielding Yes
If I understand right you are saying you have intermittent extrusion. My guess is the temperature is wrong or your feed (hobbed bolt) is slipping?
@Daniel_Fielding i am using pla at 200degrees. will check about hobbed bolt
If you can adjust the grip on the filament (usually by tightening the spring on the hobbed bolt setup or something like that) try that. You could try increasing the temperature as well, different PLA needs different temps and also different hot ends measure it in different ways.
Bijil- I run a prusa i3 with an all metal hotend and .25 nozzle.
The tension on your wades extruder is very sensitive with respect to PLA. Too much, you collapse the filament and it has issues down-hole due to the sides dragging.
Solution 1: loosen bolts/springs all the way off, raise head, hot end to 230, manual extruder set to 50mm. Click manual extrusion and slowly turn in the bolts/springs till things catch and you start extruding. Look up how to set the temp on your hotend. I have a bright blue PLA I run at 235, I have a white PLA that won’t run over 190.
Solution 2: ditch PLA, get ABS, run hot and fast. ABS is very forgiving. Your set-up should be capable of 80-100 mm/sec if tuned right… And HOT.
Good luck.
@Daniel_Bull Thats what i would have said. This exact thing happened to my Mendel
Thanks for all your help guys i think i have solved the extrusion problem it was the tension in the extruder idler . But after fixing that a new problem arised will post new with photos.@boog_nish
once again thanks for all the help @Mark_Fletcher @Brandon_Satterfield @Daniel_Bull @Daniel_Fielding
Its always good when a problem is fixed 
even if it is just one of them 
Guys this is the new problem please help me solve it
@Brandon_Satterfield i tried using ABS instead of PLA as you suggested but having lot of troubles with it. Firstly PLA not sticking at 65 degree on heatbed then the extruded filament has bubbles in them tied diffrent temprature still same problems. any suggestions.