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Very slow print


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Posted (edited) · Very slow print

I installed cura 5.3.1 on windows 64

every print is now taking double the estimated time 

benchy boats take 3 hours !. I have a Anycubic Mega s.

The benchy squid boat est 5 hours has so far been running for 8 and still going.

suggestions welcome .

Edited by kazcritter
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    Posted · Very slow print

    Load the Benchy and use the "File | Save Project" command to create a 3mf file.  Post the 3mf file here.


    If the printer's internal settings for things like Max Feedrate and Max Accel are different from what you have set it Cura then the Cura time estimate can be off by a lot.  Cura can't query the printer for it's internal settings.

    According to the i3MegaX definition:  Your Max Accel is 400 and Max Feedrate is 120.  If that is the way the printer is set up and you enter a travel speed of 150 in Cura then your printer will put a 120 speed limit on that feedrate.  In that little scenario you can see that the estimate would be off.

    Accel can have a large effect on the time estimate.  If you enter XY accel as 3000 in Cura but the printer holds it down to 400 then the estimate will be off by a wide margin.


    You can adjust the Max Accel and Max Feedrate by including lines in your StartUp Gcode.  BUT when the people who designed and built the printer decided that it couldn't handle any more Accel or Speed do you really want to ignore them?

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    Posted · Very slow print

    That was a mistake.  I looked up the Mega X.

    Your Mega S has different numbers than the Mega X and they did not change from 5.3.x to 5.4.0

    "machine_max_acceleration_x": { "value": 3000 }

    "machine_max_acceleration_y": { "value": 2000 },

    "machine_max_feedrate_x": { "default_value": 500 },
     "machine_max_feedrate_y": { "default_value": 500 },
     "machine_max_feedrate_z": { "default_value": 8 },


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