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Estimated Time Algorithm

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I have noticed that print times are often way off of actual print times. I use ~v3.0.0 with a Printrbot Simple Pro w/heated bed, if it matters. Almost all of my prints take about 30-40% longer than the estimated print time. I understand that estimating the print time is difficult because of lots of factors involved in printing.


What is the algorithm that calculates this print time?

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The algorithm works incredibly well for Ultimaker printers.   It is making assumptions about the accleration and jerk settings on your particular printer.  These are pretty high on (for example) the UM2 printer - 5000mm/sec/sec is the default acceleration.  "jerk" is 20mm/sec (not true jerk - this is a weird marlin terminology).


I think there *might* be a way to tell Cura what the acceleration is for your particular printer so that it calculates these print times more accurately.  I guess you have to know how long a typical retraction takes as well?  I suspect cura cheats and just has a certain amount of seconds for each retraction (versus knowing the E axis acceleration, max speed, retraction distance.

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It doesn't make assumptions; It uses the exact values the machine definition provides. In the case of Ultimaker, we set those to the correct values. The quality of contributed definitions can vary, so they quite often have (blatantly) wrong acceleration rates.

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