Where add a bug report.

[JeroenSAR 0]

Hello,

 

I found out that when you set your horizontal expansion to 0.001 you can reduse your time from 2 hour 58 minutes to 1 hour 39 minutes. I will put 2 photos from before and after. And I see that the retraction time is high and travel time. Is this a bug in the system or is the something wrong with my settings?
 

[GregValiant 1,245]

Bug reports go on this page on GitHub.  Make sure you include a Project File and a Cura.log file.  They will need to be zipped and the zip folder posted there.

Since I am the "vicious gatekeeper" over there I'll tell you now I can't reproduce this.  Changing the Horizontal expansion may make some difference to thin wall areas of a particular model, but for the most part it should not matter and with the couple of models I checked, it did not matter.

 

There was a poster here who was complaining about errors in the print time.  Looking at his/her setup they were using a retraction setting of 7mm at 1mm/sec.  That's 14 seconds for each retraction/prime move.  But they were also using firmware retraction.  The Cura estimate was off by hours.  It was a clear cut case of garbage in and garbage out.

Speeds in Cura are calculated by the length of an extrusion, the speed of that extrusion, and the Accel Setting.  You cannot easily disable the Accel and Jerk in the printer.  If you do not enable Acceleration Control in Cura then they aren't part of the calculation, BUT, the printer is using it's default Accel and Jerk.  That always skews the print time.  If your printer has Max Accel at 500 and you enter 3000 in Cura, the print time will be skewed.  I have found over time that Cura over-estimates the print time by about 10%.  I have a post-processor that I can add a fudge factor to.  That adjusts the Cura estimated time to something close to reality.  An M117 line sends it to the LCD.