Jump to content
Ultimaker Community of 3D Printing Experts

UM2s: UM2 Dual Extrusion Switching hack


Recommended Posts

Posted (edited) · UM2s: UM2 Dual Extrusion Switching hack

I got this switching mechanism idea already a year ago, but never took time to realize. Since I'm printing now a couple of months w/o any switching issue's, it's time to share this upgrade here on the forum.

It's working with a simple cam-plate, which is moving both nozzles at the same time. The cam-plate is bi-stable, by using the existing (UM2) springs which also hold the teflon isolator in place.

um2s_part_modifications.png

Benefits of this modification, besides enabling 2 material prints:

  • Simple modification on the existing hardware
  • Switching is done above bed clips, so no loss of additional print space
  • Modification works both on UM2 and UM2+

 

Switching in action:

 

 

Some prints:

duplo_abc_rik.jpg

Edited by EdgE
  • Like 8
Link to post
Share on other sites
  • 2 weeks later...
Posted (edited) · UM2s: UM2 Dual Extrusion Switching hack

Hello, that's a nice solution (like UMO3). Has anyone else tried that?
Is it possible to generate the needed G-Code with Cura 3.X? Are there any scripts or something else?

Maybe, it's also a solution for UMO+.

Edited by jtronics
  • Link to post
    Share on other sites
    Posted · UM2s: UM2 Dual Extrusion Switching hack

    Surprisingly simple solution! :-)

    I'd be a bit worried that cutting the bottom and removing the screws from the bottom plate makes the head much less stiff than before. Does that have any effects on the print quality?
    The prints (dragon egg for example) don't look like it.

     

  • Link to post
    Share on other sites
    Posted (edited) · UM2s: UM2 Dual Extrusion Switching hack

     

    On 3-1-2018 at 11:50 AM, jtronics said:

    Hello, that's a nice solution (like UMO3). Has anyone else tried that?
    Is it possible to generate the needed G-Code with Cura 3.X? Are there any scripts or something else?

    Thanks, well a colleague has also one printer converted to this solution. He also created the Cura 3.x definition files. :)

    His switching solution is activated by hitting the slider blocks. That will be a little bit quicker, but you loose also some mm printing space in x-direction.

    I know also, that some other people are busy with this mod, but have not seen any pictures yet..

     

    So there is a Cura 3.x machine definition available. (I will update this on my webpage.)

    The Cura modifiction is working very simple. Within the extruder definition files (ultimaker2s_1st.def.json), I just changed the line:

    "machine_extruder_start_code": { "default_value": "G0 F9000 X219 Y17.5\nG0 F1000 X223\nG0 F9000 X219" }
    So here are the coordinates stored to do the switching action for lowering the left nozzle. A similar code is added for the right nozzle.

    So the good news is, you only have the update the marlin firmware once and then you could just tune the switching coordinates in the json files.

     

     

    21 hours ago, conny_g said:

    I'd be a bit worried that cutting the bottom and removing the screws from the bottom plate makes the head much less stiff than before. Does that have any effects on the print quality?

    Good point, I did add additional mass (extra heater block etc) and the bottom plate is indeed not bolted anymore. On the other hand, there is a big spring, which presses all play out of the switching construction in one direction. Also the screws are still connected to the upper plate, compressing the plastic parts a little. From my point of view, there is not noticeable more ringing, compared to the unmodified version.  If you know a very good test stl, send a link and I love to do some tests on this issue.

    (I'm also modifying another printer, for (5x) higher printing speeds and here I do have issue's with stiffness resulting in ringing... But that will be a different topic.)

     

    This picture shows hardly any ringing, but you do see some minimal layer shifting mainly in Y direction once in a while. I guess this will be around 0.1mm.

    IMG-20170324-WA0004.jpg

    Edited by EdgE
  • Link to post
    Share on other sites
    Posted · UM2s: UM2 Dual Extrusion Switching hack

    Just have to ask what is the full point of this?

     

    I simply added another hotend and level the nozzle and the bed with a dial indicator. Im able to print dual and prints turn out great.

  • Link to post
    Share on other sites
    Posted (edited) · UM2s: UM2 Dual Extrusion Switching hack

    Generating gcode for this solution is pretty simple, like you do this with an UM3.

     

    After a  nozzle switch (T0/T1), cura is executing the additional gcode automatically.

    This could be found in ultimaker2s_1st.def.json:

    "machine_extruder_start_code": { "default_value": "G0 F9000 X219 Y17.5\nG0 F1000 X223\nG0 F9000 X219" }.

    Here you could place the commands for doing the switching movements.

    See working example here: http://www.khwelling.nl/3d/pic/um2s_cura_definitions.zip

    (These definitions are partly copied from UM3 & UM2. Be aware to save the right files in the right folders.)

     

    So the only thing you have to figure out, where your exact switching positions are and write them in both extruder files.

    (So this should also be possible on an UMO+.)

    Edited by EdgE
  • 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

      • Startups, apply for the Forward AM Innovation Award!
        Are you a startup using 3D printing? Perhaps you should continue reading... 
         
        Together with BASF we are launching the Forward AM Innovation Award - the very first global contest for startups developing new applications with 3D printing!
         
        Why apply?
        The winning startup will receive €100,000 in goods and services*, along with coaching and marketing exposure from top-notch leaders in the industry.
         

         
        Who can apply?
        Your startup creates products using Additive Manufacturing, is less than 5 years old, and has less than 50 employees. We are looking for 3D printing applications with a strong focus on innovation, sustainability and scalability.
         
        Dental aligners, shoes, tools, automotive parts, music instruments, industrial tooling and molding, medical implants, sports equipment, toys, architecture, fashion, construction... all are welcome to join!
         
        Do you have an innovative, sustainable and scalable idea that leverages the unique possibilities of 3D printing? Then it is time to apply!
        More information can be found here.
         
        Applications close on March 28th, 2021
        * What does "in goods and services" mean?
        The winner will be able to pick any item from the overall product and service portfolio of the sponsors, e.g. printers, materials, consulting, software... Choose whatever you need to accelerate your startup.
         
          • Like
        • 0 replies
      • New here? Register your Ultimaker for free 3D printer onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 0 replies
    ×
    ×
    • Create New...