I suggest a change to the value of max Z-axis Jerk to be the same as on Marlin 1.1.9 firmware used by Ender 3. Its a small change, reducing 0,4 to 0,3. Having these settings match the firmware's configuration makes a print's estimated time more accurate.
This option prefers hiding, but if no good hiding spot is available it'll expose the seam on the sharpest outer corner.
Contributes to issue CURA-6489.
In profiles that overwrite the support infill density, also keep it 0% for tree support.
Except PVA profiles. Those are probably better off with their normal infill density.
Fixes#5297.
For many printers this maximum feedrate is unknown. The rationale for this commit is that if it's unknown we shouldn't limit the speed settings.
This does cause the time estimations to be out of whack if the speed is limited on one axis but not on another axis, such as if you home the build plate while homing the head as well (when the head is much faster than the build plate). Because now Cura doesn't assume that there is a limit on any axis any more. It just holds the print speeds.
Many printers override these settings so that they have a more realistic value. Previously the value of 500mm/s wasn't very realistic anyway, as most printers have somewhere in the area of 250mm/s in their firmware limits.
Fixes#5640.
It was settable per mesh but not per extruder, but we want it to be settable per extruder as well, causing all meshes printed with that extruder to use that setting value. That's how most of these settings work (like Outer Wall Speed and such).
There are some exceptions to this where a setting only makes sense if applied in per-object settings, such as Infill Mesh or support blockers, but this is not such a setting.
Fixes#5622.
We have a long-standing issue in CuraEngine that support can be thinner than one line width and is then not generated, but if there is later some extra room it still gets supported in lower layers. This results in unnecessary support.
That issue in itself is a bit hairy to fix. But it does point out to another weirdness: PLA support has a horizontal offset of 0.2mm. This was introduced when the Support Horizontal Expansion setting was made as the default, but it was never really investigated. I asked Ultimaker's process engineers and we agreed that the setting could be set to 0 except for PVA.
Contributes to issue CURA-6438.
