I have completed around 320 hours with my P2S and AMS Pro 2 without any issues.
Until I tried Bambu Lab PLA Silk velvet eclipse (black and red) I have tried to use it on 3 occasions and every time it blocks the standard 0.4 print head after around 1-2 hours into the print?
The filament has been kept in a sealed container with silica gel in to humidity of around 20-25%
Normally I can get it unblocked, this time I’ve not managed which is really frustrating.
I heated the head and used the nozzle needle, but it seemed to be blocked at the top end where the filament goes in when I tried to remove it with pliers it just snapped off level with a top of the nozzle head.
I have tried using the cold filament through the top method to try to purge it but nothing seems to shift it, there is no way to clear the top part of the nozzle, I guess this doesn’t heat up as much as the tip.
Does this mean I need to buy a new nozzle? And how on earth does this one filament cause me so much problem when I can print literally hundreds of other things with standard and Matt PLA without any Issues??
Any help with what I could be doing wrong with the filament and ideas on if it’s possible to unblock a nozzle if the tip is clear but the blockage is at the top where the filament enters?
BTW can you buy nozzle cleaning needles? as I seem to have bent mine a bit trying to clean this one out.
any help will be greatly appreciated
Two root causes cone to my mind:
The roll could be extruded unevenly so that it is to thick in some spots. If you have digital calipers, you can check the diameter in a few spots.
The other reason I can imagine is heat creep. It becomes dangerous if the temperature inside the printer rises above ~40°C. Then the filament starts to get soft above the hot zone and swells before the nozzle or in the upper cold section of the nozzle and blocks.
This should be solvable with the heated allen key method. I don’t know if BBL still promotes this. You first unmount the nozzle from the print head. Then you heat an 1,5mm allen key with ball end to at least 200°C e.g. with a lighter. Then you quickly press it into the rear end of the nozzle, so that it melts into the stuck filament. Let it cool down and then try to pull the allen key. Hopefully it will take the stuck filament with it. That method was in the wiki for the X1C, but they might have removed it due to people burning their fingers 
Does one of those sound plausible to you?
1.5mm allen key, heat the tip of the nozzle with a lighter or torch, then push the filament through from the hotend inlet. Sometimes I add a little slug of extra filament to help force it through.
Careful when playing with fire.
Thanks I could try this before buying another nozzle.
The chamber was around 26-29 when printing.
Basically need to dump it now, so wasteful…
Try the hot hex key cold pull as described by @Alex_vG and @CarbonForge before dumping the nozzle. Heat creep is quite a common occurence which does not neccessarily ruin a nozzle. Be aware that you may need a bit of practice to get a feel for the procedure and that it may need to be done a few times in a row.
As for the next print with the Silk material, it is little bit more challenging than ordinary PLA. It is more prone to moisture uptake, warping and heat creep. So it is usually best to dry the filament before using it again.
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Thanks for your help, so I could possibly dry it on the heat bed in the chamber as I haven’t got a filament dryer
Yes, absolutely.
Filament Drying Recommendations | Bambu Lab Wiki
But you want to be on the look out for a cheap dryer during black week or second hand. It makes life much easier when you can just dry some filament while the printer is busy.
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I’ve also done the same trick with a straight pin (like for sewing), it penetrates into the filament well when heated. I did have to do the extraction with pliers since it’s harder to get a grip on the pin but it pulled out a piece almost the entire length of the hot end.
Great, I will try this.
Regarding drying the filament, I’ve just realised I can dry them in my AMS 2 pro … I just found out… oops