Added settings for max volumetric flow rate

[mjc-506]

Description

Added settings for max volumetric flow rate

This fixes #5248 (together with another PR for CuraEngine)

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

A new "Max filament flow rate" setting has been added, defaulting to 0.0 (no effect). Setting this to (say) 10mm3/sec to suit a particular extruder reduces the print head velocity to remain within this limit (especially useful with dymanic layer heights, or changing line widths etc).

Slicing STLs with this PR (and the CuraEngine one) results in slightly different Gcodes with different velocities, respecting the limit set.

Test Configuration:

• Operating System: Linux
• Cura 5.30 git
• CuraEngine 5.30 git

Checklist:

• My code follows the style guidelines of this project as described in UltiMaker Meta and Cura QML best practices
• I have read the Contribution guide
• I have commented my code, particularly in hard-to-understand areas
• [NA] I have uploaded any files required to test this change

[ghost]

Thanks for putting in the work! Max VMS is one of my main requirements on a slicer since switching to a CHT nozzle, but I really want to go back to cura!

I'll figure out how to compile cura and test this PR.

[casperlamboo]

Contribution looks good! have some minor remarks, if possible please review them yourself as well.

[casperlamboo]

See reply at Ultimaker/CuraEngine#1814 (comment)

Hi @mjc-506 sorry for taking this long to get back to you. We have had quite some internal discussions about this feature, and unfortunately we have decided to take a different approach.

We are afraid that, when using this new feature, the print behavior will become unpredictable. Instead we want to introduce a new feature that gives the user more insight whether flow jumps are violated, and can consequently change settings to make sure flow stays within an acceptable range.

Hope you understand our decision.