Speeding up prints via layer height and width...
Facing a bit of a contradiction here. I am trying to speed up large prints by making higher layers, with wider extrusions. This should in theory make much fewer pathways, but I have little success.
0.8 nozzle, 0.45 height, 0.5 width = 2d17h
0.8 nozzle, 0.6 height, 0.88 width = 2d17h.
The higher and wider layers, should result in about 50% time savings, but I gain almost nothing.I haven't adjusted the extrusion multiplier, or changed any cooling, but I have a feeling there is a throttling effect going on somewhere, which perhaps limits the speed for example.
Any ideas?
Ps: Slicer 2.6.0 Filament TPU
File is as attachment!!!
RE: Speeding up prints via layer height and width...
What is the Max Volumetric Speed, for your extruder?
Have you set the correct Max volumetric speed, In Filament Settings Advanced?
Max volumetric speed throttles print speed to whatever it has been told that the extruder can handle.
Often MVS is set low, for TPU
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK
RE: Speeding up prints via layer height and width...
No attached file, you have to zip it for the forum to accept it. Joan is correct, its highly likely that the MVS is limiting it, with the project that can be confirmed.
However there's a reason that MVS on TPU is set really low.
RE: Speeding up prints via layer height and width...
Pretty much certain to be limited by Maximum Volumetric Speed. Given how low it is for TPU, you're not going to get much out of playing with width and height.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: Speeding up prints via layer height and width...
Hi @joantabb, @neophyl, @fuchsr, great to see you all so dedicated and active on this forum!!
Ok, you are all absolutely correct. I have resolved the time saving by upping the MVS. This shows the desired results in the slicer.
The problem I seem to be having however, is now with the gcode running on my printer. Irrespective of "perimeters" speed (taken from 40 up to 240 in stages of 40) i don't get a resulting faster motion on my machine. Internal perimeters are also only printing at the same speed as external, so it seems the % stepdown isn't applied either. It is a bit worrying, as I need to know that exactly the speed I assign is received by the machine.
Machine is a Kobra Max, but I also run two Mk3's in shop.
File now attached,
Any advice much appreciated!!
Pretty much certain to be limited by Maximum Volumetric Speed. Given how low it is for TPU, you're not going to get much out of playing with width and height.
RE: Speeding up prints via layer height and width...
Still no file. Please check immediately after posting that it’s attached as the edit window is very short. You did zip it didn’t you ? And that’s zip, not rar.
RE: Speeding up prints via layer height and width...
Just to add, Kobra Max is accepting speed variation when using a PLA filament profile, but not when I am a TPU template.
RE: Speeding up prints via layer height and width...
RE: Speeding up prints via layer height and width...
You do realise that MVS can be set in 2 places and the lowest value of either is used ? The filament profile has Filament Settings>Advanced>Max Volumetric speed too. The filament setting is the one normally set in profiles, the mvs in the print profile is not as commonly used. PLA profiles generally have 15 for mvs, the mvs for tpu in your project is 3 which is pretty normal for tpu.
RE: Speeding up prints via layer height and width...
I ran out of edit time 🙂 Besides the MVS limit in the filament settings the other thing that will slow you down once you increase the mvs is the filament cooling settings. Many people miss the Filament Settings>Cooling>Cooling thresholds. The slow down if layer time is below XX gets many. That will slow down many of the layers even if the MVS is set to a high number. Change that to 1s so it doesn't slow down and you should have much more control of the speeds.
See modified project attached.
RE: Speeding up prints via layer height and width...
Greatly appreciated. I think with the measures you mention I will reach the desired speed. I will run it all through the machine and come back with results. I am working with a standard TPU, and will try a TPU-HF following success with these settings.
Few extra details, as I have a post running on the facebook group.
"Mike: You need inane flow to make speed up at a .8 nozzle, This is why the .6 is considered a good compromise…"
"James: are you suggesting a 0.6mm nozzle? I have good results with 0.8, as resolution is quite low."
"Mike: because the speeds you have to go to maintain flow on a .8 mean it’s taking the same amount of time as a .6… so no point really unless you get an uhf or higherflow hotend"
Not sure if I need to switch my volcano to uhf or higherflow hotend, but I will see after running your file. I also posted your words of wisdom there, for future reference.
RE: Speeding up prints via layer height and width...
@neophyl, I'm not able to find your path: Filament Settings>Cooling>Cooling thresholds. Trying the file you sent now, assuming the value is set to "1" as mentioned.
I ran out of edit time 🙂 Besides the MVS limit in the filament settings the other thing that will slow you down once you increase the mvs is the filament cooling settings. Many people miss the Filament Settings>Cooling>Cooling thresholds. The slow down if layer time is below XX gets many. That will slow down many of the layers even if the MVS is set to a high number. Change that to 1s so it doesn't slow down and you should have much more control of the speeds.
See modified project attached.
RE: Speeding up prints via layer height and width...
You are in expert mode aren't you ? PS has 3 modes, Simple (Green), Advanced (Yellow and Expert (Red). Simple only has very limited basic settings visible.
https://help.prusa3d.com/article/simple-advanced-expert-modes_1765
Here is the cooling settings on the filament profile.
RE: Speeding up prints via layer height and width...
Thanks, I was indeed not in 'expert mode', but am now and see the setting, which is at the said "1".
Using your file with adapted settings, I am now able to get a default print speed of 50mm/s which looks about optimum for what I need to do, although the printer is still not responding to an altered file with a speed of 100mm/s. I still need to manually adjust the % of print speed on the printer itself. In other words, I am good to print now, but still unable to completely control speeds for this particular setup.
I will continue, but will check in if I hit a wall. Again thanks for participation in this...