Cura 3.5.0 Very inaccurate printing times Ender 3

[Elpoyopopeye]

In a print at a speed of 90 mm / s, the print time shows me how 5:35 hours, but it took 9:30 hours ...

[Liger0]

Maybe jerk and acceleration control are disabled?

[Elpoyopopeye]

Sorry, where can I change that parameter?

[Ghostkeeper]

They are under the category Speed (hidden by default, so select the visibility preset "Expert"). Enabling acceleration and jerk control should make Cura's time estimate more accurate since it then knows some of the parameters that influence it. Only... They are already enabled by default for Ender 3.

Ender 3's firmware is based off Marlin, so it should be possible to get within 5% or so. CuraEngine has a routine for estimating the print time that mimics almost every aspect of Marlin's motion planner. But it will still miss a lot of parameters, since Ender 3's profile has no overrides for these machine settings: https://github.com/Ultimaker/Cura/blob/master/resources/definitions/fdmprinter.def.json#L519-L653

If those machine settings are filled in properly, I expect the time estimate will improve dramatically. The Cura developers don't have access to an Ender 3, so we have to rely on you guys to supply the correct parameters.

[Elpoyopopeye]

Thank you very much!