Jump to content
Ultimaker Community of 3D Printing Experts

Unable to retract faster than 200mm/s


joleeh
 Share

Recommended Posts

Posted · Unable to retract faster than 200mm/s

I get the same thing.  I've printed at 500mm/sec just fine but never tried to retract that fast.  You must have a very fast extruder?

 

I'm not sure where this value is coded.

  • Link to post
    Share on other sites

    Posted (edited) · Unable to retract faster than 200mm/s

    That's a smokin' extruder gr5!

     

    Many extruders are geared to provide more torque and push power.  I didn't know of any of them were geared for that kind of speed.

     

    This is in the base definition file for Creality printers.  It will either show up in your base definition or in the actual printer model definition file under "overrides".

    "machine_max_feedrate_e": { "value": 50 }

    You can carefully change the 50 to something else.

    This also might carry back to fdmprinter.def.json where the retract speeds are noted.

    "retraction_speed":
                    {
                        "label": "Retraction Speed",
                        "description": "The speed at which the filament is retracted and primed during a retraction move.",
                        "unit": "mm/s",
                        "type": "float",
                        "default_value": 25,
                        "minimum_value": "0.0001",
                        "minimum_value_warning": "1",
                        "maximum_value": "machine_max_feedrate_e if retraction_enable else float('inf')",
                        "maximum_value_warning": "70",

     

    Whatever you set it to will be affected by E-Accel.  At the generic default of 5000mm/sec² on the E - it takes 4mm to get up to 200mm/sec.  That means your retract distance would need to be at least 8mm to get up to speed.  A retract speed of 175 takes about 3mm to get to speed so I would call that the max possible for a 6mm retraction.  Average speed in that case would be 87.5.

     

    There may also be a max set in M203 in your printer or possibly in the firmware.

     

    Edited by GregValiant
  • Link to post
    Share on other sites

    Posted · Unable to retract faster than 200mm/s

    >Whatever you set it to will be affected by E-Accel

    I only retract about a mm, perhaps I'm not getting up to speed? 200mm/s did seem awfully high. I have acceleration control disabled in Cura. I'll try retracting something like 20mm to see if I can see it accelerating.

     

    I installed the Printer Settings plugin and changing the "Maximum Feedrate" there does not remove the error. Decreasing it does not affect print time until around around 15mm/s, down from 50mm/s.

  • Link to post
    Share on other sites

    Posted (edited) · Unable to retract faster than 200mm/s

    You are accelerating for 1/2mm and decelerating for 1/2mm.  Things are not instantaneous even with Accel turned off.  You could set Retraction Speed to 1,000,000 and it wouldn't have any effect on the speed.

    Now, you could possibly raise the Maximum Accel on the Extruder but there WILL be a point where the machine will hurt itself when it tries to hit that number.

     

    Set the Retraction speed to 30 and forget about it.

    Edited by GregValiant
  • Link to post
    Share on other sites

    Posted · Unable to retract faster than 200mm/s

    Certain machines have a firmware limit of 150 mm/s, I guess you are slicing for one of those.

  • Link to post
    Share on other sites

    Posted · Unable to retract faster than 200mm/s

    I have decided to use firmware retraction instead, thanks for your help.

  • 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
     Share

    • Our picks

      • New here? Get ahead with a free 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
        • 8 replies
    ×
    ×
    • Create New...