Jump to content

What Defines the Length of the Bowden Tube


Recommended Posts

Posted · What Defines the Length of the Bowden Tube

All

Hope someone can shine a light at what defines the Length of the Bowden tube..

Reason My Um 2 has a Bondtech and the bowden has a nasty habit of going nearly flat not upright,, this makes the entry into the top of the head and the exit from extruder, under pressure, and I would think cause more friction pushing the material through...

So I thought as long as the tube was NOT being stretched by the head moving across the med to all 4 corners that would be fine...

Any thoughts before I cut...

  • Link to post
    Share on other sites

    Posted · What Defines the Length of the Bowden Tube

    "What Defines the Length of the Bowden Tube?"

    The beginning and the end, of course!!

    Buh dum PSSSSshhhhhhh....

    sorry, I could not resist. Just a moment of silliness that you probably did not need. :)

  • Link to post
    Share on other sites

    Posted (edited) · What Defines the Length of the Bowden Tube

    Pull the tube out of the hotend, take it to the front right corner (the furthest corner), see how long you can stick it under the height of linear rod without too much bending.

    The next thing you need to concern is the fast forward filament run while loading filament. You need to make sure the extruder doesn't outrun your Bowden tube, otherwise the filament is going to shove into the nozzle and be grinded by the extruder.

    In the 2.1 Marlin firmware, default Bowden length is set to 705mm (set as FILAMANT_BOWDEN_LENGTH in Configuration.h tab).

    And the fast forward length is FILAMANT_BOWDEN_LENGTH-50mm (set as FILAMENT_FORWARD_LENGTH in UltiLCD2_menu_material.h)

    If you cut the Bowden tube, better subtract 705 with the length you cut off.

    With your problem of Bowden tube not being up right, you could also try a Bowden tube hook to restrain the position. I made one before: http://www.thingiverse.com/thing:2154124

    Edited by Guest
  • Link to post
    Share on other sites

    Posted · What Defines the Length of the Bowden Tube

    yyh1002

    thanks for the reply you made some points that I didn't think of ?? which is exactly why I asked the question?? thanks..

    I will look at the Boden again.. The Ums 2 is not what it started life out as std.. and I guess I replaced the tube 2 or 3 times.. so I doubt it is std length I will look at the fast forward and check..

    I also have another printer Not Um (sorry) which is heavily modded and I suspect that machines bowdens are well out, I will check the H files for the length before I cut 25mm off...

    Thanks

  • 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

      • S-Line Firmware 8.3.0 was released Nov. 20th on the "Latest" firmware branch.
        (Sorry, was out of office when this released)

        This update is for...
        All UltiMaker S series  
        New features
         
        Temperature status. During print preparation, the temperatures of the print cores and build plate will be shown on the display. This gives a better indication of the progress and remaining wait time. Save log files in paused state. It is now possible to save the printer's log files to USB if the currently active print job is paused. Previously, the Dump logs to USB option was only enabled if the printer was in idle state. Confirm print removal via Digital Factory. If the printer is connected to the Digital Factory, it is now possible to confirm the removal of a previous print job via the Digital Factory interface. This is useful in situations where the build plate is clear, but the operator forgot to select Confirm removal on the printer’s display. Visit this page for more information about this feature.
          • Like
        • 0 replies
      • Ultimaker Cura 5.6 stable released
        Cura now supports Method series printers!
         
        A year after the merger of Ultimaker and MakerBotQQ, we have unlocked the ability for users of our Method series printers to slice files using UltiMaker Cura. As of this release, users can find profiles for our Method and Method XL printers, as well as material profiles for ABS-R, ABS-CF, and RapidRinse. Meaning it’s now possible to use either Cura or the existing cloud-slicing software CloudPrint when printing with these printers or materials
        • 48 replies
    ×
    ×
    • Create New...