Filament replacing problem

[cnguyen]

When I try to replace the filament, I try to pull out the old one and it stuck in the printer head. Please advise the easy way to remove the stuck filament.
Thank you.

[shaman]

Basic question, have you heated the print head to ~200C before trying to remove the old filament? This is necessary in order for the plastic to not be “glued” to the print head.

[cnguyen]

yes, I heated up to 200 deg before trying to remove the plastic.

[cnguyen]

one piece of plastic filament stuck inside at the beginning of two gears. I could not take it out

[shaman]

I would try raising the temperature to 220C, maybe even 230C, and then use a pair of needle nose pliers to pull the piece out. I had a clog and had to raise the temperature high enough to almost burn it out to clear the plug.

[cnguyen]

I try to use tweezer but could not take it out. the piece of filament is inside the hole below the gear. What else can I do ?
Thank for your help.

[cnguyen]

I finally removed the piece out but in the process of taking it apart, I loss the tightening knob on the floor and could not find it. where can I get this part to replace?

Thank you.