I designed a model for work that broke too easy at lower infill. It needs a high amount of infill to have durability and to keep them from being broken accidentally. I decided on eSun PETG and I cranked up the infill and some border thickness until the prints became as strong as I felt they needed to survive general use. My initial nozzle is 0.35mm with Auto on the width. The issue I am running into is the print is taking around 24 hours to print even though S3D says 10. Print speed is 80mm/sec. I have to figure out how to speed it up, but also maintain strength and function.
My design is boxy and functional and has no real fine detail, so I was thinking a larger diameter nozzle say 0.75 mm would help to print it faster. I really haven't used one except for the 0.50 mm one for ninjaflex. I don't have any experience with settings for the larger 0.75 mm nozzle in S3D.
For models with no surface detail, would the 0.75 mm nozzle be a better choice for me and cut down my print time without sacrificing strength?
Thanks,
Jerold
Speed and Strength - 0.75mm Nozzle?
Re: Speed and Strength - 0.75mm Nozzle?
That's typical: the time estimate doesn't include the acceleration limits imposed by the firmware.CCRN wrote:taking around 24 hours to print even though S3D says 10
Probably not as much as you'd expect.would the 0.75 mm nozzle be a better choice for me and cut down my print time
A 0.35 mm nozzle can extrude about 10 mm³ of plastic per second, so a 0.75 mm nozzle should extrude 46 mm³/s, based just on the area ratio. Increasing the thread width from 0.4 mm to 0.9 mm and the thread thickness from 0.25 mm to 0.6 mm will just about soak up the additional volume.
Because the incoming filament diameter remains the same, the extruder motor must turn 4.6 times faster, moving the filament at 19 mm/s instead of 4 mm/s. You may need to reset the maximum motor speed and tweak the acceleration limits to make retraction work correctly. Adjusting the slicing parameters will surely improve the part's appearance, too.
However, the hot end must bring the plastic up to the proper temperature in 1/4.6 the time and that probably won't work, because the M4 hot end is barely 20 mm long: the melt time would be 1 second, instead of 5. There's a definite upper limit to how fast the hot end can transfer heat into the moving plastic and 19 mm/s will push it hard.
If that's the case, then you must reduce the maximum extrusion speed, perhaps by a factor of 2, which means the big nozzle cuts the print time down by only a factor of 2.3 (-ish).
If the larger thread dimensions improve the part's mechanical properties, the larger nozzle may be worthwhile, but it can't make the parts pop out of the printer in hours, rather than days.
Re: Speed and Strength - 0.75mm Nozzle?
I found a nice balance with a .6mm nozzle. I can still print relatively fast (though I need to bump the temp slightly) and parts are printed considerably faster than with my .4mm. It does take some time to dial in the print settings but it can be a nice way of cutting down some time.
Also for better time estimates of prints you might look at http://www.gcodeanalyser.com/
Also for better time estimates of prints you might look at http://www.gcodeanalyser.com/
Re: Speed and Strength - 0.75mm Nozzle?
Thank you both for responding.
Jerold
Jerold
Re: Speed and Strength - 0.75mm Nozzle?
The video is years old (and potato-quality), but here is a 0.66mm V3a running PLA @ 220C.
I was using 0.50mm layers at 120mm/sec print speeds. Nothing modern can touch it -- even a Volcano. Try it out -- there's occasionally folks selling V3a's in the FS section. It'll cost you $15 to get one, and I'm pretty sure the V4 nozzles will fit well enough, if you can figure out the jam-screws.
https://www.youtube.com/watch?v=BGJska4xnyw
I was using 0.50mm layers at 120mm/sec print speeds. Nothing modern can touch it -- even a Volcano. Try it out -- there's occasionally folks selling V3a's in the FS section. It'll cost you $15 to get one, and I'm pretty sure the V4 nozzles will fit well enough, if you can figure out the jam-screws.
https://www.youtube.com/watch?v=BGJska4xnyw
Custom 3D printing for you or your business -- quote [at] pingring.org
Re: Speed and Strength - 0.75mm Nozzle?
In round numbers, that's 0.8 x 0.5 x 120 = 48 mm³/s, five times faster than the 10 mm³/s I'm noodling along at.insta wrote:0.50mm layers at 120mm/sec
Note the V3a has a long long <i>long<i> hot end, maybe 35 mm, with the heater wound all over it, for plenty of melt time while the filament travels along.
Maybe not quite enough capacity to print lawn furniture (*), but certainly good enough for a fat nozzle!
I'm pretty sure the nozzle threads aren't interchangeable, though.
(*) This is a hot end:
http://www.3ders.org/articles/20120213- ... idges.html
Last edited by ednisley on Fri Jul 07, 2017 1:28 am, edited 1 time in total.
Re: Speed and Strength - 0.75mm Nozzle?
The nozzle threads are interchangeable (both M6) but the internal sealing geometry might be different.ednisley wrote:In round numbers, that's 0.8 x 0.5 x 120 = 48 mm³/s, five times faster than the 10 mm³/s I'm noodling along at.insta wrote:0.50mm layers at 120mm/sec
Note the V3a has a long long <i>long<i> hot end, maybe 35 mm, with the heater wound all over it, for plenty of melt time while the filament travels along.
Maybe not quite enough capacity to print lawn furniture (*), but certainly good enough for a fat nozzle!
I'm pretty sure the nozzle threads aren't interchangeable, though.
(*) <i>This</i> is a hot end:
http://www.3ders.org/articles/20120213- ... idges.html
I also had to run it at 19v to keep up with the PLA soaking heat out.
Custom 3D printing for you or your business -- quote [at] pingring.org
Re: Speed and Strength - 0.75mm Nozzle?
I was printing at 245c with my E3D for white PLA at 65mm/s using the 0.6mm with 0.45mm layer height. Its bizarre to see the spool moving that fast. It did however cut the print time on the object I was printing from 3+ hours, at .35mm layer height, to around 1hr 40m so definitely worth it for me. Because the M2 is such a beast as well the quality was still great.