Taz 5 Hotend problem, please help

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BaltimoreBully
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Taz 5 Hotend problem, please help

Post by BaltimoreBully » Thu Mar 05, 2015 2:51 pm

I am having another problem with my Taz 5. I have had it for two weeks as of yesterday. I printed out a large herring bone gear and that print went well. Yesterday when I got I home from work, I figured that I would print out the small one and see how that went. Well the printer started acting like the extruder was clogged and nothing would come out. I removed the nozzle and soaked it in acetone overnight. This morning I cleaned the nozzle out and reassembled the extruder, but now I am having a different problem. Every time I try to print or just to extrude filament, the filament just curls up on itself and the printer wont print anything. If there is anyone who can walk me through fixing this or has an idea what would cause it, I would really appreciate your help. I really just want to get back to printing. Thanks in advance. Below is a video of the problem that I am having.
Last edited by BaltimoreBully on Mon Jun 01, 2015 4:15 pm, edited 1 time in total.

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mhackney
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Re: Taz 5 Hotend problem, please help

Post by mhackney » Thu Mar 05, 2015 3:40 pm

That sounds like you have burr on the edge of the nozzle orifice. I like to polish my nozzle tips with a clean cloth and polish. You can use a little toothpaste instead, it works quite well. Clean and rinse and dry when done then hold it up to a light and look through. The hole should be smooth and round.
Sublime Layers - my blog on Musings and Experiments in 3D Printing Technology and Art

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A Strategy for Obtaining Great Prints

Strategies for Resolving Print Artifacts

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Orias
Aleph Objects | LulzBot
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Re: Taz 5 Hotend problem, please help

Post by Orias » Fri Mar 06, 2015 2:26 pm

Since the Hexagon nozzle requires a specific torque when tightening the nozzle we recommend cold pulls prior to anything. More information can be found here on cold pulls: viewtopic.php?f=36&t=1772

BaltimoreBully
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Re: Taz 5 Hotend problem, please help

Post by BaltimoreBully » Sun Mar 08, 2015 1:35 pm

I attempted to do several cold pulls before I took the nozzle off. I don't know if it's because I'm using hips or if my technique wasn't right but I couldn't get it to work. I have had the nozzle soaking in acetone for three days now and have been cleaning it each day. If I can not get it cleaned properly is there somewhere where I can get a new nozzle that is .35. I did an online search and everything I found simply said .3 mm.

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bradintheusa
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Re: Taz 5 Hotend problem, please help

Post by bradintheusa » Sun Mar 08, 2015 8:02 pm

Hi

I took my nozzle off cleaned it but it was a royal pain to get back on. Getting the threads to align and not stripped was hard (aka impossible).

After cleaning it and putting in on I have a few problems with PLA but my HIPS is worse and just like yours. If it does not tangle up it looks like this. That's an Allen key next to the purple HIPS
IMG_5372.JPG
Any ETA on when the new hotends will be for sale?

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mhackney
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Re: Taz 5 Hotend problem, please help

Post by mhackney » Sun Mar 08, 2015 9:07 pm

Wow, you couldn't pay to make filament do that on purpose! But that really indicates something odd in the extrusion path. Could the path through the extruder and hot end be constricted or misaligned?
Sublime Layers - my blog on Musings and Experiments in 3D Printing Technology and Art

Start here:
A Strategy for Obtaining Great Prints

Strategies for Resolving Print Artifacts

The Eclectic Angler

wantmys2000
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Re: Taz 5 Hotend problem, please help

Post by wantmys2000 » Mon Mar 09, 2015 6:21 am

I have seen that happen once on my Taz. It happened when I was manually extruding at a way too fast speed. I was used to my old 1.75mm machine and extruded at 200mm/min and it looked just like that. When I backed it down to 50mm/min it extruded straight as an arrow.

discojon
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Re: Taz 5 Hotend problem, please help

Post by discojon » Mon Mar 09, 2015 11:42 am

I too get some bad extrusion when using Octoprint to manually extrude filament. I believe the issue to be to rapid of extrusion. On my machine it is much more prominent with HIPS than PLA. Try to slow it down and see what happens.
TAZ 5, Open rails X,Y,Z. Marlin 1.1 RC2. Mangrove dual fan, reinforced extruder mount

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bradintheusa
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Re: Taz 5 Hotend problem, please help

Post by bradintheusa » Mon Mar 09, 2015 6:39 pm

I gave the nozzle a good polish and tighten but it seems to have no effect. Slowing down the extrusion did not help either.

I took a look at one of my PLA cold pulls under a magnifying glass and it is possible something is in there so I might try a HIPS cold pull and if that does not work take it off again.

discojon
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Re: Taz 5 Hotend problem, please help

Post by discojon » Sun Mar 15, 2015 4:38 pm

I too am now having this issue. My filament is extruding in free air as a spiral. I have pulled the nozzle, torched it to clean it out, polished the outside and what i can of the inside, and it is still happening. Pretty sure there is a bur / something in there but can't see it. Any suggestions?
20150315_182712.jpg
20150315_182723.jpg
TAZ 5, Open rails X,Y,Z. Marlin 1.1 RC2. Mangrove dual fan, reinforced extruder mount

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