PETG didn't stick  

RE:

What is your print sheet? It looks like marble.. ahh.. upside down.. sorry.. . What filament are you using? What temp is the hotend? What temp is the bed? Did you calibrate the Z for your print sheet? .. If you are using the Rough sheet for the first time, it has a different Z offset than the smooth sheet. 

RE: PETG didn't stick

Hi,

thanks for answering. I used GEETECH PETG 220°/75°. It worked fine for 2 years. I assume my printbed wasn't clean enough. Now I have the problem to clean the extruder a. s. o. without destroying it.

You have a small blob of doom with a side of spaghetti. Search for blob of doom to see how others have dealt with them.

Before doing anything, look at pictures of a clean extruder and note the position of the rather delicate wires that are currently hidden, if you damage them you will have to buy replacement parts as broken wires can't be rejoined.

You have probably damaged your fan shroud and will need a replacement.

To remove it:

Raise the nozzle temperature to the printing temperature for the filament in question and allow it to heat for several minutes.

If you are lucky you will be able to prise the blob open - more likely you will need to add heat from outside with a heat gun to aid the softening, sometimes it's worth using a soldering iron to carve chunks off the mass.

Use needle nosed pliers to prise this away; remove it in parts if it won't release the wires.

Once you have the worst removed you decide whether you need to disassemble the extruder to get at all the blob or perhaps you can clean up in situ.

After the cleanup there will be overcooked filament inside the nozzle so at least a purge and probably a cold-pull will be necessary.

Cheerio,

RE: PETG didn't stick

Hi Diem,

thank you very much for your comprehensive answer. So I'll have to go to work.

Best wishes

Bernd