Jump to content

Recommended Posts

Posted · Avoid implicit G-Codes after Start G-Code

Cura creates implicit G-Codes after the Start G-Code and before the sliced object.

;Generated with Cura_SteamEngine mb-master-20210516
M82 ;absolute extrusion mode
; >>> Printer Start G-code
; allow preheat in fluiid/mainsail
;M109 S235.0 
;M190 S75 
;M106 S0 
; start gcode is handled by Klipper
START_PRINT T_TOOL=235.0 T_BED=75 FAN_SPEED=0
; <<< exit Start G-code
G92 E0
; >>> Extruder Start G-code
; <<< Extruder Start G-code
G92 E0
G1 F1800 E-2
;LAYER_COUNT:32
;LAYER:0

How can I convince CURA not to insert this implicit retract before Layer 0?

 

  • Link to post
    Share on other sites

    Posted · Avoid implicit G-Codes after Start G-Code

    I don't think you can.  It's usually a good thing - it prevents the nozzle from leaking while it moves to the start of the skirt or brim.  Then it does an E0 which undoes that retraction and then it starts printing the skirt or brim.

     

    If you take out the E-2 it will leak a bit and there will be less filament for when it starts printing the skirt/brim.

     

  • Link to post
    Share on other sites

    Posted · Avoid implicit G-Codes after Start G-Code

    @gr5 and @SusisStrolch,

    When I was tweaking my start gcode I was having trouble getting the head to "pick up here, move over there, start to extrude".  It turned out to be that line that was the issue.  My fix (not a great one) was to use the Search And Replace plugin and search for G1 F1800 E-2 and replace it with G92 E-1.5.  Since there was no longer a retraction, the filament was right at the nozzle and the later G1 F1800 E0 that precedes the start of printing ends up being a good prime.  Now my skirt (or whatever) starts right up.

    The downside to using the Search and Replace is that if I change retraction speed or retraction distance, the search criteria has to change as well.  The second downside is that if the same line was to appear later in the gcode (which is exceedingly unlikely), it would be changed as well.

     

  • 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

      • Help Us Improve Cura – Join the Ultimaker Research Program
        🚀 Help Shape the Future of Cura and Digital Factory – Join Our Power User Research Program!
        We’re looking for active users of Cura and Digital Factory — across professional and educational use cases — to help us improve the next generation of our tools.
        Our Power User Research Program kicks off with a quick 15-minute interview to learn about your setup and workflows. If selected, you’ll be invited into a small group of users who get early access to features and help us shape the future of 3D printing software.

        🧪 What to Expect:
        A short 15-minute kickoff interview to help us get to know you If selected, bi-monthly research sessions (15–30 minutes) where we’ll test features, review workflows, or gather feedback Occasional invites to try out early prototypes or vote on upcoming improvements
        🎁 What You’ll Get:
         
        Selected participants receive a free 1-year Studio or Classroom license Early access to new features and tools A direct voice in what we build next
        👉 Interested? Please fill out this quick form
        Your feedback helps us make Cura Cloud more powerful, more intuitive, and more aligned with how you actually print and manage your workflow.
        Thanks for being part of the community,

        — The Ultimaker Software Team
        • 0 replies
      • Cura 5.10 stable released!
        The full stable release of Cura 5.10 has arrived, and it brings support for the new Ultimaker S8, as well as new materials and profiles for previously supported UltiMaker printers. Additionally, you can now control your models in Cura using a 3D SpaceMouse and more!
          • Like
        • 18 replies
    ×
    ×
    • Create New...