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Increase Print Time Estimate Accuracy?

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I was wondering if there was something I could do to increase the accuracy of the print time estimate after slicing.

In both v15.x and 2.1x, the current estimates are around 20%-25% under. In other words, if Cura estimates a 8hr print, it will take closer to 10hrs. For a 1hr estimate, its usually takes 1hr 15 mins.

Maybe this is just an artifact of a non-Makerbot printer or its firmware specific. I read some previous posts from a few years back about acceleration factors. So maybe there is a tweek I can add to a parameter in Cura (15.x or 2.x) to take this into account and narrow this delta a bit?

Wondering if anyone else is seeing this delta or if its just me and my printer.


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Cura used to always be inaccurate in predictions but then they included most of the marlin planner mechanism into the planning and now it's spot on - around 1% error. But they used the acceleration and jerk settings for a typical Ultimaker and even Ultimaker people mess with that. Ultimaker is 25% faster at the speeds you print (because of the higher acceleration). So one solution is to buy an ultimaker. :)

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Found the fdmprinter.def.json file on GitHub and have been trying to insert the Acceleration and Jerk settings for about 3 hours last night before giving up. I thought maybe they weren't implemented yet, but then saw this post:


Clearly, I'm doing something wrong. Any help on this would be greatly appreciated:


"speed": {       "acceleration_enabled": {           "label": "Enable Acceleration Control",           "description": "Enables adjusting the print head acceleration. Increasing the accelerations can reduce printing time at the cost of print quality.",           "type": "bool",           "default": false,           "settable_per_mesh": false,           "settable_per_extruder": false       },       "acceleration_print": {           "label": "Print Acceleration",           "description": "The acceleration with which printing happens.",           "unit": "mm/s²",           "type": "float",           "min_value": "0.1",           "max_value_warning": "10000",           "default": "300",           "enabled": "acceleration_enabled",           "settable_per_mesh": true       }   }


Edited by Guest

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The nightlies of Cura can have jerk & acceleration set per "feature"

Very cool but that doesn't answer my question.  Are these accelerations used to calculate the print time or is print time calculation not configurable (hardcoded)?

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