<p>I just changed my nozzle on my Anet A8 after it was fully used up. When I started printing with my new 0.4&nbsp;mm nozzle (same as before) my <a href="https://imgur.com/a/2x42LTB" rel="nofollow noreferrer">extrusion</a> was VERY bad and inconsistent, even so bad I couldn't continue printing because it would pull the first layer off. </p>

<p>If I compare it to my <a href="https://imgur.com/a/oOOK50y" rel="nofollow noreferrer">extrusion</a> before the nozzle switch, it is really bad, even though I tightened everything as before. I am quite sure it doesn't have to do with adhesion to the heated bed since I use tape with PVA glue. </p>

<p>Any advice on how to remove this under extrusion so I can continue printing?</p>

<p>All the specs:</p>

<ul>
<li>25&nbsp;mm/s first layer print speed</li>
<li>200&nbsp;&deg;C nozzle</li>
<li>60&nbsp;&deg;C bed</li>
<li>PLA filament;</li>
<li>0.4&nbsp;mm nozzle size</li>
</ul>

<p>Let me know if there is anything else you need to know.</p>

Your good extrusion look also a little bad , and the bad extrusion looks like a big feeding problem. for this you need:
Feeding.- try to tight the presure of the feeder thread, the one that press the filament on the extruder.
Bed Adhesion.- Use between 32° and 38°C if you are using masking tape, on higher temperatures the masking tape becomes to peel off if any border of the printing part is close to the edge of the tape.
Sand the masking tape surface and clean it to be free of dust (eliminate shiny surface) with this is enough to get a good adhesion; I recommend TUK and 3D brands, they are sticky. If you need more adhesion you can spray a little hair spray, just one pass.
Clogged Nozzle.- you need to clean it, on your kitchen stove heat the nozzle until melt the filament, then use some cooper wire (some phone wiring has it) to remove residues inside the nozzle. If posible you can buy a drill bit with 0.4mm diameter to ensure a complete cleaning.