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I just got a anet A2 3D printer and i am having pigtail clogging issues in the heat sinc above the heating element on the nozzle, when i go to print the print starts normal but when it gets to the second or third layer it will stop extruding plastic, and the filament will be pig tailed in the heat sinc are that i described earlier. if you no how to stop tis please let me now cause i would realy like to start printing with it.

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sounds like your fans are blowing on the nozzle try turning down your fan speed and watch during the print if your temp holds or fluctuates. If it fluctuates, take note of how much it fluctuates and keep turning your fan speed down until the fluctuation is no more than 3-4 degrees total. Also make sure the extruder fan is turning on and that its not on its way out sometimes they start to slow down after a while causing the issues your experiencing

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My tempature wasnt fluctuaring but i got the pigtailing solved, i am having problems with the fan on the heatsinc by the nozel, it deosnt stay on, so like u were saying about it not being on is there a way to make it stay on, cause even when i manually turn it on it still will turn off after a few minutes, and also i am having layer hight isues it gets the first two layers down then on the third the nozel is rubbing on the print and it is causing a clog, i am leveling with a index card to were i feel a slight resistence on the card, is there a better way or is something else causing it.

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the heatsink fan sounds like it’s on its way out, go ahead and replace it ( i end up replacing mine every 4-8 months usually), they just end up losing power from the torture of the heat, so you should always have extra fans and thermistors around in case something like this happens. Your machine grinding against the 3rd layer sounds like one of a few things, either theres debris on your z rods, really simple just wipe em clean, your x axis may not be level to the bed, or last but not least your printing a little too close. your leveling method sounds good but make sure the index card is only .1mm I personally use regular printer paper. hope this helps