Close
Login to Your Account
Results 1 to 3 of 3
  1. #1
    Join Date
    Jan 2018
    Location
    Posts
    2
    Downloads
    0
    Uploads
    0

    Melted plastic blob on extruder head of SST768

    Hello all-

    Our SST768 has worked well for the 6 months we've had it, but recently we started to experience what to me was an unusual problem.
    After an overnight run, there was a large blob of melted filament plastic attached to the underside of the extruder head. After opening up the head, we found that
    melted plastic had worked its way inside the head as well - see the attached photos of "incident1". Judging from the filament colored plastic dust on the built plate, the blob had been rubbing against the build plate for some period during the build.

    After cleaning off all the plastic with a heat gun and acetone, we were able to print a few objects without difficulties ... but then the problem happened again - see photo "incident2".

    So before trying another print, I'd like to ask if anyone has experienced a similar problem on their printers and if so, what did you determine to be the root cause.

    It's been suggested in other forums for consumer 3D printers that this type of filament "caking" issue occurs when the printed object delaminates from the build platform and sticks to the extruder tip.
    What I can say is that in general our prints adhere strongly to the build plate - in fact, removing the object takes some effort, especially on small prints that are not affected by warping the plates by hand.
    We have had two instances where the print did come off the plate, but they were both tall, high aspect ratio parts - the parts fell over and filament spaghetti filled the chamber.

    So spontaneous part delamination due only to poor adhesion would not be be my first guess as to what the root cause of the melted blob was.

    Thanks for any help or insight you can provide!
    Attached Images Attached Images

  2. #2
    Join Date
    Nov 2015
    Location
    Italy
    Posts
    26
    Downloads
    0
    Uploads
    0
    For me there is no doubt tube or nozzle broken, but if you want to be sure you have to disassemble the liquefier (be carefull with thermocouples and firerod)and check where model material comes from, if you are looking for a replacement visit www.stampa3donline.com.

  3. #3
    Join Date
    Jan 2018
    Location
    Posts
    2
    Downloads
    0
    Uploads
    0
    Thanks for your reply, gzan59. I did check after cleaning the plastic off, but was not able to detect any cracks in the nozzle or liquefier in general - it could the case that they are hidden or too small to be easily seen.


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Question- What is 'foam' with respect to sst768
    By Blown454 in forum Stratasys
    Replies: 2
    Last Post: 09-05-2017, 02:11 PM
  2. SST768 Z-Foam Sensor
    By kjn260 in forum Stratasys
    Replies: 3
    Last Post: 11-29-2016, 10:19 AM
  3. NEED HELP Extruder head shifted
    By verga in forum General 3D Printer Discussion
    Replies: 1
    Last Post: 08-04-2014, 03:44 PM
  4. JUST IN Dual head "all metal" 3d printer extruder
    By 3DPFadmin in forum Hardware (stepper motor, drivers Etc)
    Replies: 2
    Last Post: 06-14-2014, 02:36 PM
  5. Reusing the plastic bases SST768
    By Mjolinor in forum Stratasys
    Replies: 3
    Last Post: 06-01-2014, 09:25 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •