Actual support speed won't change, no matter what.
I use Prusaslicer to print fairly big objects that don't need a lot of detail, however their shapes require a bit of support. I managed to tweak the other speeds but the support almost always took 40-50% of the estimated time even though it only takes up around 1/3 of the total weight. Thing is, no matter what I change the support speed to, both the estimated and actual printing time do not change, even if I enter some absurd value like 500 mm/s. I have tried every solution I've found on the forums and Reddit to no avail. So far I've tried turning auto cooling off/setting the "slow down if layer time is below" to something like 2 seconds, setting the max volumetric speed, max print speed and maximum feedrate E (machine limits) to either no limit or a very high value - nothing changes and the estimated support time stays exactly the same no matter the speed set. If I toggle on speed view, it shows the correct speed (the one I set) but the estimates and the print process itself do not reflect that. What could I have missed? Printer is CR10-V3.
I use Prusaslicer to print fairly big objects that don't need a lot of detail, however their shapes require a bit of support.
Have you considered making custom supports for the model, and treating them as normal print objects. Then you can minimise the use of filament and maximise print speed!
regards Joan
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Maximum volumetric speed may be a factor
If you are printing large areas of support at higher speeds, you may be running into the Maximum volumetric speed (MVS) limit of your hotend. Slice your part and examine the volumetric speed being used for each feature. Compare that to the MVS limits under Print Settings->Speed (likely 0 for disabled) and Filament Settings->Advanced. The more restrictive value is used.
Unfortunately, you can't just raise this value and expect things to work. Your hotend has a finite capacity to heat and move filament.
I have notes on this topic here that you might find useful.
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