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CovertLemon

Cura 3.0 Time Estimate Not Accurate

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I've been using cura with an Ultimaker 3 for nearly a year now and something I've noticed is that the time estimates aren't always very accurate. It may be that they never have been and I've only noticed them being wrong occasionally.

A recent print I set to go was predicted at 2hr 10mins, but ended up taking an extra 30mins, while another print was predicted 30mins and took 40mins instead.

I've been looking for some sort of answer on other forums but while some say they don't have the issue, others say they do, but most of these people are not using an Ultimaker 3D printer. I do use an edited version of the 'Fast' print profile which reduces print times mainly by decreasing the top and bottom layer heights, but by also increasing most of the speed settings. I don't know whether this affects the estimate, but I'd assume that these settings should be taken into account when calculating the print time.

Wondering if anyone else is having this issue, and if someone has managed to fix it?

Thanks in advance n_n

Edited by Guest

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*Edit*

I've been monitoring my prints to see how the print time changes with the percentage completion, and for the first time I've actually seen the print time go down... It's a longer print which contains 2 parts instead of just one, and it hasn't changed as much as the other prints have. Nothing else has been changed except for which nozzle I'm using.

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Basically, you're comparing the estimate from Cura with the estimate from the UM3 printer? Am I correct?

The printer will adjust the estimated time based on 'real time' measurements.

So the mileage may vary.

Sometimes layers will go faster which will reduce the total printing time, then layers will take more time, adding to the total printing time.

That may explain the differences you've seen.

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I was actually comparing the 'printing time' on cura it self, it's been changing as the print goes along, but I'd assume they are effectively the same thing?

ah okay, that makes sense. So is there no way to increase the accuracy of the initial estimate? I'm keeping track of how long prints take and how much material they use as the printer is used for work based projects, so knowing that the data is likely not correct is rather annoying.

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I have always found my time estimates to be within an acceptable range and a marked improvement from what I had researched before getting my printer in January.

But, I may be a bit more lenient than others because I am used to dealing with rendering estimates that can really vary wildly based on what Marco_TvM said. A render could speed along and hit areas with a lot of reflections/refractions and just bog down and throw everything off.

Over the last year, I have developed a feel for the time approximate and allow for a bit of slop in either direction.

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We are investigating how accurate the estimates are and see if we can improve these. Please be aware that as they are 'estimates' this is not high on our priority list.

Yes I understand, I was just wondering if there was a way to increase the accuracy as I sometimes get error margins of 20-30%. So trying to set up multiple prints through the day would have been a bit easier :)

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We are investigating how accurate the estimates are and see if we can improve these. Please be aware that as they are 'estimates' this is not high on our priority list.

Yes I understand, I was just wondering if there was a way to increase the accuracy as I sometimes get error margins of 20-30%. So trying to set up multiple prints through the day would have been a bit easier :)

Wow! That is really off. I have never had anything that far off. Seriously, on a several day print, it may be off by 30 minutes. On an hours long print it may be off by only a few minutes.

I wonder why you would be getting such a wide spread of estimation:result......

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Wow! That is really off. I have never had anything that far off. Seriously, on a several day print, it may be off by 30 minutes. On an hours long print it may be off by only a few minutes.

I wonder why you would be getting such a wide spread of estimation:result......

That's what was confusing me, and I don't always get estimates that are that bad, others are within a few minutes when the print is around 2-3 hours. I was wondering if it is possibly down to what action the printer is currently taking. For example, it may be that when it's putting down support there's a big margin of error, so prints with more support vary more form the orginal estimate.

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Wow! That is really off. I have never had anything that far off. Seriously, on a several day print, it may be off by 30 minutes. On an hours long print it may be off by only a few minutes.

I wonder why you would be getting such a wide spread of estimation:result......

That's what was confusing me, and I don't always get estimates that are that bad, others are within a few minutes when the print is around 2-3 hours. I was wondering if it is possibly down to what action the printer is currently taking. For example, it may be that when it's putting down support there's a big margin of error, so prints with more support vary more form the orginal estimate.

I am not so sure that supports have anything to do with it as I use a boatload of PVA on my prints.....many have thin and/or spindly parts. And it runs consistently between those prints and non support prints.

Edited by Guest

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Hi there,

most of our prints have been within 1-2% of the estimated time in Cura, except one. It was estimated at 12 hours and 51 minutes but is still printing currently and has been doing so for more than 22 hours... no issues with the output so far but just taking much longer than anticipated. I have gcode and STL if you would like me to upload it somewhere, in case it will help your investigation.

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I am also struggling with the estimated times. I would love to know how to improve them.

I used this model: https://www.tinkercad.com/things/g2wf4flqvjs-anycubic-i3-mega-dial-indicator-mount

Which resulted in this G-code: https://gist.github.com/brnl/af0fc099c0c81589a79fd732e9f4bf9d

My printer is an Anycubic i3 Mega, and I have added it as a "Prusa i3", Gcode flavor 'RepRap'.

Hope this helps, and I hope you will be able to help me :-)

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