Nozzle Problems!

[jenjaw 0]

Hello,

I just started using the Ultimaker, I'm using it through my university for research purposes so it was bought as an assembled kit to save time. I've been printing successfully with ABS at 250 degrees for the last week, however during a print today the ultimaker stopped extruding so I tried feeding the filament through manually, but that didn't work. I checked other posts on here about clogged nozzles so I took it apart and removed the clogged up ABS until it was actually feeding through the nozzle (success!). Then, as I was reassembling it, I was tightening the nozzle to the PEEK insulator, and I may have over tightened it as the brass screw attaching the nozzle to the insulator seared leaving the screw thread partically stuck inside the insulator and the nozzle stuck to the aluminium heating element. Clearly, I was annoyed at myself, and that's a lesson learned about over tightening (though I swear it wasn't that tight), anyway I was wondering if:

A) Has anyone else has issues with ABS getting stuck in the extruder nozzle,

&

B ) what could be the possible cause of this e.g. flow rate/temperature?

Thank you!!

 

[illuminarti 18]

Firstly, welcome!

Secondly, oh no!!

Thirdly.... this thread has some info about possible difficulties with ABS leading to nozzle clogs due to heat traveling up the filament, and causing it to deform where it shouldn't...

http://umforum.ultimaker.com/index.php?/topic/1925-modification-to-the-hot-end-for-abs-printing/?p=13390

 

[gr5 2,224]

There is a tool that is like a reverse threaded conical drill that makes removing the broken pieces easy. But you will have to heat everything up to at least 100C (boiling) or preferably hotter (around 200C is good). You will need to order a new nozzle I think. Sucks for you - sorry.

Do you have a heated bed? Most people have great trouble with ABS warping untill they get a heated bed. ABS is much harder to get working nicely than PLA but you *can* do it.

 

[jenjaw 0]

Thanks for the help, that link is great, I'm terrible with the search on this forum it never seem to find these things!

I don't have a heated bed but I have has some good prints without using the 3M Blue tape and adding a raft in Cura, I think the main thing is getting the nozzle close enough to the printer bed to get it to stick without damaging the bed and nozzle.

 

[mrcdesign 0]

The search part on this forum is indeed weird. But illuminarti and gr5 are not far away. Thumbs up to you guys.

gr5 told me that you should use a piece of paper between the nozzle and the bed, if you put the paper in between and slide it a bit, and its just touching a bit, your fine. Do this on all 4 corners.