SOLVED Replacing an original UMS5 extruder nozzle only

[GoncaloLaranjeira 1]

Hi everyone,

 

Today I got my AA 0.4 extruder of my UMS5 completely clogged, tried cleaning it with clean filament (hot pulls and cold pulls) but I can't get anything out.. It even exploded a little bit of filament through the top of the extruder away in on of the pulls, when I was trying to push the filament down.

 

I already disassembled the nozzle form the extruder, and now I wonder if is it possible to only purchase a nozzle instead of a complete extruder..

 

If yes, where? Is there other better options, like switching to an Olsson Ruby nozzle?

 

And other question: can you actually switch to a 0.8mm nozzle and go around Ultimaker software to mimic a AA 0.8 extruder, instead of buying a full AA 0.8 original extruder?

 

Some feedback would be very appreciated! Share some experiences when trying to do any of the above if you have some!

 

[Carbon 28]

As far as I know, you can't buy the "nozzle only" you HAVE to buy a new extruder.

 

We've experienced this, and rectified it by using a wire off a "Wire Brush"......yes a wire brush, heating the nozzle to operating temp, then pushing the wire through the nozzle hole then did a HOT and COLD pull, it now works a treat. 👍

[Smithy 1,144]

Standard nozzle are too small and don't fit. There are one or two 3rd party vendors which made replacement nozzles, but I don't recommend it. Why? Because the problem is that the core is very fragile and you have to tighten the nozzle very hard back into the core. If you don't do that, the risk that filament comes out on the upper part of the nozzle is high and in that case you can fill and damage your whole print head. In other cases, the print core breaks when you screw the nozzle in.

 

And to answer the question about AA 0.4 and AA 0.8. You can adjust the line width in Cura, that's usually enough, but there us also a way to reprogram the Core to an AA 0.8. Search the forum for instructions, it is only a special gcode.

[GoncaloLaranjeira 1]

Hi guys! thanks a lot for your info!

I'm gonna try a needle with 0.4mm or less.

 

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As far as I know, you can't buy the "nozzle only" you HAVE to buy a new extruder.

 

We've experienced this, and rectified it by using a wire off a "Wire Brush"......yes a wire brush, heating the nozzle to operating temp, then pushing the wire through the nozzle hole then did a HOT and COLD pull, it now works a treat. 👍

Isn't a wire brush too abrasive for the inside of the nozzle? I read somewhere that if you get abrasive materials into your nozzle, the plastic that you'll print after, will tends to stick a lot more to the irregular walls of the nozzle..

 

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Standard nozzle are too small and don't fit. There are one or two 3rd party vendors which made replacement nozzles, but I don't recommend it. Why? Because the problem is that the core is very fragile and you have to tighten the nozzle very hard back into the core. If you don't do that, the risk that filament comes out on the upper part of the nozzle is high and in that case you can fill and damage your whole print head. In other cases, the print core breaks when you screw the nozzle in.

Smithy, yes I agree, the print core is too fragile, but you can operate it by always grabbing the heating block, but yes, it's definitely not recommended taking the extruder apart.

 

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And to answer the question about AA 0.4 and AA 0.8. You can adjust the line width in Cura, that's usually enough, but there us also a way to reprogram the Core to an AA 0.8. Search the forum for instructions, it is only a special gcode.

Will check that, thanks a lot!

[GoncaloLaranjeira 1]

Hey everyone, just to clarify that I could unclog the nozzle and printed 2Kg of PLA so far with no problems at all!

 

What I did was pre-heated the extruder to 280ºC and then with a 0.3mm needle work my way from the tip to the core, slowly but strong, and voilà!

 

Thanks everyone for the help!

[JohnInOttawa 104]

A bit late to the party.

I suggest a read of this thread.

 

I've done this with a MicroSwiss nozzle.  All of the warnings about why it is a bad idea are valid.  It can be done but with great care not to destroy the threads, the heat break, or the print core frame.  The torque involved is small and precise.  Too little, you will leak, too much and you'll destroy the core.

 

The steps I followed are detailed in the thread.  Prints with the new nozzle are identical to the OEM but the print core frame appears to deform with heat over time and will ultimately decide end of life.

 

Good luck!

John