Nothing is extruded
Last night my PETG spool (black) has finished in the middle of a print.
In the morning I wanted to put a new ABS spool (black) to print something else.
However nothing was extruded.
I tried with an PLA spool. Nothing.
I tried to clean the nozzle with the acupuncture needle provided. Even if the needle entered inside more than 2cm, nothing happened.
Temp was 255 Celsius. (for the ABS).
If I push the filament manually it doesn't work (it doesn't advance).
The filament loaded was only slightly took by the extruder which ate it. I can clearly see the part which was 'carved' by the pulley. I tried to clean the pulley - it seems that something in the middle, above the nozzle but below the extruder's hobbed pulley is blocking the path.
If I enter the needle I can feel it - it is like a plastic located from above (extruder hole) at aprox. 3 cm and from below (from the nozzle tip) at aprox. 2,5 cm. What it is interesting is that if I introduce the needle from below till end and leave the needle inside when the nozzle is preheated, the needle will stuck and I need some force to get it out. If I try to clean the nozzle by normal movements (up-down 1,5-2 cm deep) everything is fine.
Any ideas how to solve/unclog this?
TIA
Re: Nothing is extruded
Maybe this helps: http://help.prusa3d.com/mk2-nozzle/clogged-nozzle
Re: Nothing is extruded
Thanks. Did it but nothing. If I make the idler tension bigger, then a tak-tak-tak noise is heard but nothing happens. The filament isn't advanced.
The cold pull doesn't work. Perhaps the path is blocked in some way. Some (dis)assembly instructions are to be found somewhere? (preferably with pics)
Re: Nothing is extruded [SOLVED]
Yes, I solved it... by disassembling the entire thing. The last part of the old filament remained inside the hot-end's radiator blocking the entrance of the new one. A common printing problem (see https://all3dp.com/1/common-3d-printing-problems-troubleshooting-3d-printer-issues/ which is noted at #1).
IMHO this is a major design flaw, because when we print big prints we cannot accurately calculate the remainder of the spool and/or stay next to the printer to see what it is happening.
IMHO (again) a filament monitor like one from https://www.toybuilderlabs.com/collections/featured/products/tunell-3d-printer-filament-monitor is quite necessary if we want to do serious work - however I couldn't find anything for Prusa.