horst.w wrote: ↑
Thu Feb 14, 2019 4:58 am
I think, the calculation of print time doesn't consider the acceleration and jerk, because the program can not know them. But if it would be known, on my printers I have reduce the values in behalf of print quality.
I have test it with 5 objekts, always 1 mm height:
square 100 x 100 mm
square 50 x 50 mm (will be 25% of the 100 x 100)
circle diameter 113 mm (will be nearly 10,000 mm² ~ 100 x 100)
circle diameter 56,5 mm (will be nearly 2,500 mm² ~ 50 x 50 or 25% of 100 x 100)
rectagle 250 x 40 mm (will be same as 100 x 100)
print time is 59 min and 15 min (4 x 15 = 60)
material is ~ 1,540 and 400 mm (4 x 400 = 1,600) filament (2,83)
This shows, that acceleration and jerk can not be considered, because the objects have all the same volume / surface or 25% of it. But the lines to print are very different, from very long running (rectangle) over the squares and very short lines printing the circles. That can not be realistic but it provides a base to make a own calculation comparing the real print time .
For this I have set all values for the Firstlayer and Infill to 100 so that the the conditions are comparable.
The influence of M-codes for acceleration and jerk, inserted into the start-script, I have not tested now, but would be very interesting.
The given values of the firmware are unknown to the program.