mfish38
commented
1 year ago In order to demonstrate expected behavior, and act as a hacky workaround, I examined the feed rate of the perimeters and bridges in the generated g code in the case where dynamic overhangs were off, and the volumetric limit was applied. I then used those as the overhang speeds in the dynamic overhang settings in the cases I wanted the volumetric flow to be the limiting factor, and setting lower speeds in cases where overhangs were having issues. The result looks like this where the perimeters are printed at the flow rate expected, and the problematic bow is lower/slower:
Description of the bug
When dynamic overhang speed is used it overrides the max volumetric speed and sets speeds higher than the volumetric flow limit. This is prevents setting low overlaps to a high enough speed that they are limited by the volumetric speed instead of a set speed.
Project file & How to reproduce
3DBenchy.zip
For example, in the "speed for print moves" setting 300 for speeds I want to be limited by the volumetric flow setting in the Auto Speed section, which I have set to 10 mm3/s:
Trying to set dynamic overhang speeds to 300 causes the volumetric flow limit to be ignored producing flow rates in excess of 23 mm3/s:
Checklist of files included above
Version of PrusaSlicer
Version 2.6.0-alpha5-win64
Operating system
Windows 10 Pro 22H2 19045.2728
Printer model
ender 3 s1