Jump to content
Ultimaker Community of 3D Printing Experts
Ytzen_PLTW

Unable to swap print cores

Recommended Posts

I've had my U3 for about 8 months now, but I've mostly just been running dual extrusion PLA prints. I haven't printed with PVA in about 6 months. I went to swap out print cores today so that I could to a print with some PVA and I am unable to remove the core. 

 

I remember it being tough to pull out before, but both myself and a number of students have been unsuccessful this time. I'm wondering, does it have anything to do with the different heights of the cores (seen in attached pictures). Printcore 1 is held higher as if it was going to be printing from printcore 2. 

IMG_20180425_072436094.jpg

Share this post


Link to post
Share on other sites

are you squeezing the print core a little bit when you try to take it out? there is a spring in there that is supposed to keep everything in place. The reason printcore 2 is lower is because when it is the the heightened position the print core is blocked. 

Share this post


Link to post
Share on other sites
59 minutes ago, Nicolinux said:

Looking at the picture, the second print core might have been inserted in a wrong way at first. The cores should be at the same height. Here is a picture of my print head:

 

@Nicolinux Do you think it could be in wrong but still make contact well enough for the printcore to connect? Cause i assumed that was not possible and that is why i ignored the position of the print core. 

Edited by Job_van_gennip

Share this post


Link to post
Share on other sites

In the photo I can see some orange pla sticking into the core.  That material must be pulled out far enough so the core can slide out.  It's easy to do - just squeeze the lever on the feeder and pull down on the filament just below the feeder.

Share this post


Link to post
Share on other sites
1 minute ago, gr5 said:

In the photo I can see some orange pla sticking into the core.  That material must be pulled out far enough so the core can slide out.  It's easy to do - just squeeze the lever on the feeder and pull down on the filament just below the feeder.

That's not mine. Mine's the one with the blue filament that has been pulled out

Share this post


Link to post
Share on other sites

Well there are 4 things that can hold the core in from most common issue to least common issue:

1) Filament at the top

2) Not squeezing enough - you need to lift that steel part up and above the anodized aluminum part inside the head

3) The clear part has two holes in it that catch on two wedges in the head.  You might have to push down a bit on the clear part.  Without squeezing the "trigger" you can explore this by pushing the clear part into the head and listening for a snap.  push down and pull out on the clear part such that it moves out and repeat until you know how much to push down on the clear part to get it past those two wedge/bumps.

4) The pcb on the core can slide down too much and get behind the rear of the anodized aluminum part in the head that holds the cores in place.  The best solution to this issue is to remove the swinging door cover of the head (takes 3 seconds - squeeze it off the hinge) so you can get your fingers under the core better.  Then push up on the rear of the core while trying to slide it out the normal way.

 

There may be a fifth issue that I don't know of and have not experienced.

 

Share this post


Link to post
Share on other sites

Thanks everyone... I'll have to check out some of the suggested solutions in the future.

 

I've got a backlog of parts to print and since those will work with just PLA, I'm running those first. It'll be at least a day or two before I make another attempted swap

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Our picks

    • Introducing Ultimaker Cura 3.6 | Beta
      Ultimaker Cura 3.6 | Beta is available. It comes with new features, bug fixes, and UX improvements. We would really like to have your feedback on it to make our stable release as good as it can be. As always, you can download the beta for free from our website, for Windows, MacOS, and Linux.
        • Like
      • 92 replies
    • Print Core CC | Red for Ruby
      Q: For some users, abrasive materials may be a new subject matter. Can you explain what it is that makes a material abrasive when you are not sure which print core to use?
      A: Materials which are hard in a solid piece (like metals, ceramics and carbon fibers) will generally also wear down the nozzle. In general one should assume...
        • Thanks
      • 30 replies
    • "Back To The Future" using Generative Design & Investment Casting
      Designing for light-weight parts is becoming more important, and I’m a firm believer in the need to produce lighter weight, less over-engineered parts for the future. This is for sustainability reasons because we need to be using less raw materials and, in things like transportation, it impacts the energy usage of the product during it’s service life.
        • Like
      • 12 replies
×

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!