Make sure you have exited CuraUnder your Cura installation directory, navigate to /resources/definitions/Before you edit anything, make a backup of the file: fdmprinter.def.jsonOpen fdmprinter.def.json in a suitable text editor such as Notepad++ (regular Notepad in Windows may cause problems with file formatting)Find “machine_acceleration” which will have a default value of 4000. Change it to match the acceleration in your printer’s firmware. (For example, mine is 800 per this recommendation)Right below that, find “machine_max_jerk_xy” which has a default value of 20. Again, change it to match the jerk in your printer’s firmware.Save the file, close it, and launch Cura.Enjoy more accurate print time estimations! http://ift.tt/2leynXq