I have seen some insane videos of people doing a benchy in under 3 minutes…
But I have not seen a speed benchy done with the recommended defaults and realistic quality.
I am asking as I finally got my hands on an Obxidian hotend.
So far it seems the things just outperforms any flow rate test that is not optimised for those high flow hotends.
But for the standard Benchy with all benchy defaults the speed or time gain is minimal.
I guess I actually have two questions, so let me try to be precise:
What is the fastest for a standard benchy on our Bambu printers using Studio to slice it?
Be that A1, P1, X1,…
I mean this in terms of the benchy still coming out as good looking as when printed with the recommended speeds…
Not some wrinkled mess on a plate with a blob as chimney…
Second question:
As those high speed nozzles have no issues outperfoming our max print speeds of 500mm/s:
Why does the slicer slice for even faster speeds with no issues ?
If the machine limit is fixed to 500 than it would make sense that the slicer is aware of this.
With no way of actually knowing how fast the head moves I wonder whether or not prints get messed up if the G-code says faster while the machine limits step hard on the brakes…
My first benchy took over 2 hours to complete so it would look good.
God knows how many years later I see my print head moving at speeds we though back in the day would be impossible forever.
But what do we do if Bambu won’t give us more speed to max out those hotends?
Is it an artificial limit or a realistic limit based on the wear and tear of the moving parts ?
With top speeds only possible on models that allow for it I guess we should be more than happy with ‘just’ 500mm/sec…
The best I can do without getting the feeling the machine falls apart is around 28 minutes in 0.2mm layers throughout.
Comes out with only minor imperfections around the holes and chimney.
A few lines on the hull where the area is printed slower.
Funny enough, with variable layer heights it comes out even better and only takes 4 minutes longer.
Would love to know though where the limit is as I still have room with the flow rate.
But with the outer walls already set to 500mm/s I don’t think the machine will go any faster…
Which is weird as the time compared to the standard profile @200mm/s is almost identical…
I think, several things add up here:
Benchy is a really small models. So if you haven’t adjusted in the material settings, minimum layer time will kick in and slow down the print speed. You can check that in the preview when you select “speed” from the drop down.
Then, for such a small model, probably flow or print speed isn’t the limiting factor but acceleration. So most time is spent on slowing down around corners. The short distances where it achieves those 500mm/s don’t have a big influence on total print time and it doesn’t make much of a difference if it is 300 or 500.
Unfortunately, the slicer preview doesn’t reflect acceleration and declaration, so you won’t see that.
So the increased throughput woll mostly be evident with big models with little complexity.
The benchy was created as a tuning tool for quality, not to check the speed, I realise that.
But that’s exactly my point here as well.
I would like to see how fast you can print it in the best possible quality, not so that is something on the plate that somehow looks a bit like a melted boat LOL
And yes, a more modern test model we could all agree on that is able to show us the speed limits of you machines and hotends is more than overdue if you ask me.
Speed AND quality I mean here, not smear and blobs…
I don’t see that happening. First, it is almost impossible to agree on what is the quality that you have to achieve. Quality is a bunch of different aspects that are hard to compare. Maybe one printer has better cooling and therefore prints nicer overhangs, while the other printer has more even outer walls due to better bearings. If the first can print 2 minutes faster with acceptable overhangs, but the other has nicer walls no matter the speed, which is the winner?
Then, bigger models need a lot more material and at least I don’t feel like wasting hundreds of grams of filaments just for showing off. I don’t see what else it would be good for.
Most parts I print are finished within a fraction of the time they would take on my Ultimaker 2+, which is great. From here on, other aspects play a much bigger role for me than the ultimate speed.
If someone, for example, has to print and awful of similar or identical models it would be beneficial to know whether the default and resulting time is good or not.
A full plate taking 9 hours to print in great quality might sound nice but if you COULD get the same result in let’s say 7 hours it might make a big difference for a small business.
A corresponding test model to check the limits of high flow hotends does not have be huge and costing lots of filament.
All it needs is to fit the purpose.
Since it is about Bambu and Studio it is already clear that the outcome will differ for the printer models and possible modifications.
It would still allow for establishing a base line for those printers…
Just saying
I think somewhere on the bambu wiki, you can download the .3mf of the benchy embedded in the printer, including the settings. They have changed quite some settings compared to the default settings. E.g. i think layer height is 0.24mm and others.
I’ve found that for a lot of stuff using the default profiles and then pushing it to 166% at runtime (“Ludicrous” speed setting) usually doesn’t impact quality at all, so there sure is some margin.
EDIT: I actually need to try printing the built-in benchy at 166% for fun…
Their Benchy is a fake
The benchy was created as a testing and calibration model to avoid having to print a ton of test prints and well, to look cute…
Goal is to use it so you can address print issues, fix them and try again to confirm.
Means you start with a WORKING base profile.
Bambu faked the entire purpose of the the Benchy by using it for rather misleading advertisements to state print speeds their machine won’t reach under NORMAL print conditions.
I tried the Bambu version and right after with their Benchy settings a complex model - try this way and you know why the Bambu Benchy times are just a hoax
The best I can manage with my high flow hotend on a cold morning is around 24 minutes using a layer height of 0.2mm and keeping the standard extrusion widths for the 0.2 profile.
Those 24 minutes create a complete Benchy but that does mean I would find the result acceptable enough for top quality, far from it actually…
So for me, the benchy is just a model for calibration. But what are you calibrating exactly? Well its either your nozzle, or your filament or you are adjusting for a specific balance of speed vs quality. Lately i have been experimenting with transparent petg on the creality k1, and using the benchy model is useful to double check once i have adjusted all my filament and speed settings. Temperature vs flow rate vs pressure advance vs infill are just a few things that seem to affect transparency in my particular case
