Thinking about trying to obtain faster print speed



  • Hi,

    Below are the current settings for my FT-5:

    ; --- X, Y, Z ---
    M92  X80    Y80    Z400			; steps per mm
    M906 X1000  Y1000  Z1000  I30		; motor current (mA) and idle current (30%)
    M203 X12000 Y12000 Z2400 		; max speed (mm/min)
    M201 X1000  Y1000  Z20  		; acceleration (mm/s^2)
    M566 X600   Y600   Z600  		; max instant speed change (jerk) (mm/min)
    
    ; --- Zesty Nimble extruder ---
    M92  E2700	 	 		; steps per mm
    M906 E500				; motor current (mA)
    M203 E3600				; max speed (mm/min)
    M201 E120				; acceleration (mm/s^2)
    M566 E60				; max instant speed change (jerk) (mm/min)
    
    M350 X16 Y16 Z16 E16 I1 		; 16x microstepping with interpolation
    
    

    I normally print at 60 mm/s and get good results.

    To print at 90 mm/s what (if any) of the values above are likely to need adjusting?

    Thanks.

    Frederick



  • Looking at the config, your printer is allowed to move at 200mm/s maximum speed, and the extruder is allowed to push filament at upto 60mm/s (note this is filament speed and 60 is high - that equates to 144.3mm^3 per second for 1.75mm filament, most hotends run at around 10mm^3 per second max).

    This means that the config is not your limiting factor.

    Typically the limiting factors are: what hotend do you have (some hotends have a theoretical maximum printing speed of 60mm/s at 0.2mm layer heights), what quality do you need (printing faster can reduce the quality of prints, if there are for example play in an axis)?

    For my Ender 5+, I swapped out the hotend for a E3Dv6 Volcano, to get a bigger melting zone (thus increasing the filament flow rate), I then made use of a 0.6mm nozzle. This allows me to lay down more filament in the same amount of time (compared to my other printers). By ensuring that the axis are stiff and properly aligned, I am able to increase the printing speed significantly without losing quality (for example there is no ringing).

    Another factor in getting a high print speed, is a high quality extruder that can push hard enough. Fast printing have increased pressure in the hotend, and it does not help when the extruder starts skipping steps or worse, grinding the filament.


  • Moderator

    Start with the max volumetric flow rate of the hotend and work backwards to find your max speed based on layer height and width.

    https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165



  • Thanks all.

    I think that high rate for the extruder was to handle retraction - that number came from the Zesty web site - I think.

    The link seems to give me a good starting point.

    Frederick


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