0.25 nozzle won't extrude Ultimaker 2+

[neatgadgets 0]

I cannot get my 0.25nozzle to work at all on the Ultimaker 2+. Is there a trick to getting it done? The reason I need it is I am trying to print a part that has a long thing hexagonal pole and it doesn;t do it evenly in other sizes. 

[gr5 2,230]

Is line width set to 0.25 (or smaller) in cura?

 

What do you mean it won't work at all?  Does it prime?  Maybe something got into the nozzle - I'd do a cold pull.  Are you familiar with cold pulls?  Read up on these.

[neatgadgets 0]

The nozzle blocks and won't feed through any of the filament. Yes it has been set to 0.25in cura.

[Nicolinux 288]

It is 0.25mm not inch (just trying to avoid confusion).

In order to test if the nozzle is blocked, you could remove the bowden tube at the head, heat up the nozzle to 220C and push some filament by hand into the nozzle (from the top). Make sure to move the head to one of the four corners in order to not bend the smooth rods the head moves on when applying pressure.

If nothing comes out, the your nozzle is clogged and you need to unclog it.

Another reason could be that the nozzle does not heat up properly. The temperature sensor might got loose and report wrong temp values. Or it might be broken too.

[gr5 2,230]

Often when I change filaments if it won't extrude sometimes the filament is stuck higher up in the head.  I always cut the filament to a point before sliding it into the bowden (I don't use the menu item to insert filament - I just shove it in).

 

Also I have needles that will fit even inside a 0.25mm nozzle.  I can use those to poke around if something is inside the nozzle I can push it up into the filament and then a cold pull will solve the problem.

 

I recommend you also read up on how to do a cold pull properly.  There's hundreds of posts about this and videos on youtube and descriptions at fbrc8.com and ultimaker has their own guides on doing a cold pull.

[neatgadgets 0]

We know it was blocking. We had to unblock it. It blocks every time weary and print using 0.25

[neatgadgets 0]

2 hours ago, gr5 said:

Often when I change filaments if it won't extrude sometimes the filament is stuck higher up in the head.  I always cut the filament to a point before sliding it into the bowden (I don't use the menu item to insert filament - I just shove it in).

 

Also I have needles that will fit even inside a 0.25mm nozzle.  I can use those to poke around if something is inside the nozzle I can push it up into the filament and then a cold pull will solve the problem.

 

I recommend you also read up on how to do a cold pull properly.  There's hundreds of posts about this and videos on youtube and descriptions at fbrc8.com and ultimaker has their own guides on doing a cold pull.

 

No idea what a cold pull is but I will look it up. I will also look for a. 25 needle

[cjs 34]

15 minutes ago, neatgadgets said:

No idea what a cold pull is but I will look it up.

Ultimaker calls it the "Atomic Method" which is described here: https://ultimaker.com/en/resources/19510-how-to-apply-atomic-method