Blocked Nozzle
From Wiki
A nozzle can become blocked for a variety of reasons such as...
- over heating the polymer,
- acrylic from the bed getting into the hole after accidentally raising the bed too high
- or contamination of the filament.
remember that the hole in the nozzle is 0.5mm (or less) and such a tiny orifice needs to be looked after and treated with a little respect and care
There are different ways to overcome a blockage... it's worth trying the easier ways first.
A first try should always be to heat up the hot end, remove the filament, cut off the end and try again.
You could then try the following:
1. Let the extruder cool to room temperature
2. Remove the extruder pressure bearing and snip the filament near the top within the pressure bearing recess
3. Set a suitable operating temperature for the loaded filament
4. When the temperature reaches 130C, pull on the filament with pliers to remove it from the hot end. If it does not move, wait until the temperature increases further. Basically the aim is to melt the outside of the filament to loosen it so the majority of filament can be pulled out from the hot end
5. Carefully push a 0.5mm drill bit with pliers into the nose of the extruder
6. Reload the extruder with filament in the usual way
If that does not work I would suggest taking the extruder apart and using the larger drill bit (3mm?) to clear the hot end where the solid filament enters.
note that [5] will in 99.9% of cases increase the dia of the nozzle as 0.5mm drill bit if you don't push it in perfectly straight it will cut into walls (aluminium being soft, especially when hot) and widen the hole a bit... If you can find 0.3mm bit it will be much safer operation.... or some users have found it "safer" to use the leg of a capacitor (or other electronic component)as it is softer and more flexible and therefore less likely to damage the hole or snap off if your hand wobbles.
also in most cases the clog is on the other side so touching the orifice should be the last thing you try
