Problems Attempting to Increase Speed Of Print
Hi All
I am working on a personal project that required me to make a thin box that is just about 2 perimeters thick. The model is fine and it slices but I am trying to reduce the print time. Since it is a simple object I thought I could change a couple of settings prusa slicer. According to the the readout most of the box is considered an external perimeter. I should be able to change the speed settings and reduce the printing time. However no matter what settings I put in I don't see any changes in the printing time. See the images below. I even cranked the speed settings up to crazy high values but nothing seems to change.
I updated to the most recent build of prusa slicer and also tried a couple of different objects. Results stayed the same. It seems to update when I change other settings. For some reason its just the speed settings that I don't see any changes. I cranked everything up to 9000 just to see if there would be any updates but I got nothing. Has anyone else noticed this problem? Is it just the estimated time that is off?
I haven't actually tried printing the items with the different settings but I will try that in the meantime.
Thanks!
RE: Problems Attempting to Increase Speed Of Print
Is it possible your object reaches maximum volumetric output at the original speed? Or the object is too small for the print head to accelerate to a higher speed?
Consider changing layer height if that will not impact appearance too much. It is the easiest way to decrease print time.
Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor
RE: Problems Attempting to Increase Speed Of Print
Hey Bill
Thanks for the reply. Im not sure about the output. I have definitely printed at higher speeds before but it was with larger objects. It could be that the size is too small and there isn't enough time to accelerate. I hadn't thought of that.
I just did a quick test with a scaled up version of the box. The speed does lower when reducing the speed. I think you are correct. The object is just too small to accelerate.
Unfortunately I have to keep the current layer height due to project requirements. I have experimented with most of the settings and shaved about 10 minutes off which is good. I have to print a fair number of these so I'll take any minute I can get.
Thanks for the help!
RE: Problems Attempting to Increase Speed Of Print
The slicer has a speed limit for layers that take under X seconds. The default is 20 seconds; the slicer will slow print speed down towards the minimum 15 mm/s trying to make the layer take 20 seconds to print. Set the filament cool down timer to something like 2 seconds ... you should see the print speed jump to your expected values. The risk is mushed parts if multiple layers start getting too warm.
RE: Problems Attempting to Increase Speed Of Print
If your printer/filament is dialled in you could experiment with reducing retraction. I have 2 printers a mk3 and what used to be a bowden cr10s. I could slice the same models and the cr10 would always be slower to print. Even if i set the speeds and accelerations the same. The thing that was causing the difference was the retraction settings. When I modified the cr10 to be direct drive and set the same retraction value then the print times became almost the same. So it might be worth experimenting with lowering your retraction and z hop values a little and see what that gives you.
RE: Problems Attempting to Increase Speed Of Print
tim and neophyl
those are awesome suggestions. I will play around with both today and see how that affects things.
Best
RE: Problems Attempting to Increase Speed Of Print
Just a quick update - the slow down setting definitely helped. For starters I set the time down to 5 seconds and it cut down the time by about 40 minutes. No loss of quality thus far! I will continue to experiment as needed but that seems to be the main culprit.
I also tried adjusting the zhop but it didn't have a huge affect. I was only doing this with one object - perhaps this will come into play if I print a large batch. I'll keep it in mind!
Thanks to everyone who contributed!