Jump to content
Sign in to follow this  
somerwil

Extruder jamming

Recommended Posts

Posted · Extruder jamming

Hi guys,

I'm frequently jamming my extruder. This problem occurs mainly after I tried to extrude material at too low temperatures (ie Netfabb standard settings). The nozzle itself is fine and is not jammed, my material gets jammed inside the PEEK insulator. The feed mechanism on the outside works perfectly and has enough force to push the material into the tube

I think my tube is not getting into the PEEK part far enough. On the instruction wiki it says the Bowden tube needs to get out of the bottom wood part for about 8mm. I can do that but when I place the PEEK on top of it, the cable doesn't slide all this 8mm into the PEEK. When I complete the assembly, the cable goes into the PEEK for approx. 5mm and pushes the tube back for some 3mm. I can imagine my cable is not directly connected to the brass piece of the hot end and thus creating a unwanted buffer.

Any suggestions?

Share this post


Link to post
Share on other sites
Posted · Extruder jamming
I'm frequently jamming my extruder. This problem occurs mainly after I tried to extrude material at too low temperatures (ie Netfabb standard settings). The nozzle itself is fine and is not jammed, my material gets jammed inside the PEEK insulator. The feed mechanism on the outside works perfectly and has enough force to push the material into the tube

I think my tube is not getting into the PEEK part far enough. On the instruction wiki it says the Bowden tube needs to get out of the bottom wood part for about 8mm. I can do that but when I place the PEEK on top of it, the cable doesn't slide all this 8mm into the PEEK. When I complete the assembly, the cable goes into the PEEK for approx. 5mm and pushes the tube back for some 3mm. I can imagine my cable is not directly connected to the brass piece of the hot end and thus creating a unwanted buffer.

There are a couple of things inside the hot end that needs to be solid and never move: one is the PTFT tube inside the PEEK, and the PTFT retainer ring/clip above (if the ring/clip does not support the bowden tube anymore, print some reinforcement:

http://www.thingiverse.com/thing:11864

).

The PTFT needs to make a solid flat connection to the brass tube inside the PEEK:

IMG_4072.jpg

As you can see it is very difficult to get a perfect perpendicular cut/connection, and if the PTFT isn't pressed hard enough against the brass, plastic will leak, and the problems start.

you can solve this by drilling out some of the bowden with a 4.5mm drill (by hand), not much deeper than 0.5mm (depending on how far the brass tube extends out of the PEEK):

IMG_4073.jpg

IMG_4076.jpg

(In this example I drilled a bit too deep, but you can shave off some of the PTFT to lower the depth of the bevel.)

Now the Brass tube can slide into the PTFT ever so slightly (especially if your brass tube thread is turned down a bit), making a much better seal:

IMG_4074.jpg

Share this post


Link to post
Share on other sites
Posted · Extruder jamming

Fantastic! Thanks for the tip and included pictures. Did you make these yesterday or are they on the internet? They should make it into the wiki/ troubleshooting.

I'll try this out tonight and let you know if it worked for me.

Share this post


Link to post
Share on other sites
Posted · Extruder jamming
Fantastic! Thanks for the tip and included pictures. Did you make these yesterday or are they on the internet? They should make it into the wiki/ troubleshooting

I just shot them this afternoon, specifically for this purpose... if they want to migrate into the wiki, fine by me.

Let us know if it helps.

Share this post


Link to post
Share on other sites
Posted · Extruder jamming
Nice mod, I forwarded this to the Ultimaker team!

oh, cool... I thought you ARE the UM team... but so far this has been the easiest fix to fix the way too common jamming issue...

Share this post


Link to post
Share on other sites
Posted · Extruder jamming

Thanks for the hack, I've created a "Jamming" page on the wiki -

http://wiki.ultimaker.com/Jamming

- explaining how I unmount the extruder to remove the jammed PLA by tools and including your hack.

It might not be the best method, and it's a bit long (20-30 min), but it has helped me twice last weekend :)

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

  • Our picks

    • Ultimaker Cura 4.0 | Stable available!
      Ultimaker Cura 4.0 is mainly focused on the improved user interface and cloud integration.
      As always, we want to collect your user feedback for this release. If there are any improvements you can think of, feel free to mention it here and help us to shape the next release.
      • 65 replies
×
×
  • Create New...

Important Information

Welcome to the Ultimaker Community of 3D printing experts. Visit the following links to read more about our Terms of Use or our Privacy Policy. Thank you!