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Dancer
@OG

I assume you are printing PLA because of the temperatures.

Might it be possible you are printing top layer with extremely fine extrusion width at average speed? ( = low ammount of PLA used)
Or do you even have a hotend-fan? - Is it at 100% all the time?

Both things might result in heat creeping up the hotend, PLA getting to soft and thus clogging. After some more preasure sometimes it comes loose again, and printing continues.

As you manged to print the temp-calib-tower without this problem, this would match, because there is no big, fine top layer.

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OG
What is B value R value is 100k and this exact thermistor, that e3d uses, was found in marlin config.. but I hope that this issue of mine is related to hotend heating..
because I am not that skilled in bed leveling so I am affraid that that causing the issues..

got to ask now, that when we are talking about bed leveling are we talking bed's mechanical leveling so that bed is attached to frame evenly so it is leveled that way or does this bed leveling procedure include endstop height calibration? I am so noob with 3d printing that I don't know even basic 3d printing terms/vocabulary or such.. but I learn (hardest way)

and what comes to attaching bed to frame what is the easiest way to do this so that bed is evenly "balanced". I have regular circuit board pillars, but I think this is not the best possible way to do it

also I have heard that e3d v6 with 0.4 nozzle is very very difficult to use.. is that correct information??

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OG
Yes I have heated bed, it is that aluminium heated bed that came with sintron's kit, but there is borosilicate glass on it (I tought that I have concave and convex surface on that aluminium one)

I have tried to print with temperature of 222C and I don't know dare I raise this temperature much..(I still quite noob in 3d printing)

I have heared rumors, that E3D v6 needs a bit higher temperature to work properly..but I am not sure..

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Qdeathstar
Hi. I am not sure if this printer has a heated bed, but if it does its possible that your print temperature is slightly low. When the nozzle is close to the heated bed, it doesn't loose as much heat is the filament is extruded through it, but once it raises above the bed a little bit, the air is cooler up there and the extruded jams a little bit, causing this under extrusion. Try boosting your temp by 10c and see what happens.

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OG
Do You mean that is the extruder properly mounted and does not move while extruding?
if so the answer is yes..

or do you mean that is there "constant" pressure on the filament..
then answer is yes and no (simply I am not sure)

I made some investigations to sort this problem out..
I have 5:1 geared extruder that is mounted to a "hercustruder", an airtripper variant.
It has MK7 gearwheel that feeds filament.. (all steppers have pololu drv8825 drivers adjusted to 1 amp [vref=500mV])

I tried to feed filament by hand trough the bowden and hotend it felt OK.. (newbie opinion)
then I feed filament by extruder only to bowden to check does the bowden cause extra resistance if I bend it (I made various tight corners)
extruder worked well.. then I attached bowden to the hotend and extruder started to "slip" and I think this causes the problem..

I am a bit confused because this extruder setup should work like a charm.. even with smaler nozzel sizes
I increased hotends temperature but it did not help much..(I did hotend pid and heatbed pid also)

by the way is the extruder max acceleration value 10000 too much in marlin config?

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seanthemighty
I had done, however I realised I had an older version of slicer (1.17), so upgraded to 1.29, again made sure all settings were right(ish), and it printed (huzzah!). Strangely though, when I pulled to gcode into pronterface, it placed it outside the build area (but printed fine). Now it's on to calibration, have done 2 XYZ cubes now, first one better than the second (I updated the kinematics, made them more precise, made it worse oddly). Have just notice the effector is not perfectly level, seems one of the arms is loosey goosey, so in the morning will redo that. Think I need to slow down the homing speed too, is pretty quick so I think slight imbalance will come from that. Given (I assume) we have all the same printer (more or less), is there an accepted, community created set of marlin settings?