Filament retraction.  

RE:

Enable expert mode in the Slicer and more options will be available, such as retraction and z lift ( z hop) and z loft if distance is above certain threshold.

In slicing there is also an option to avoid crossing perimeters.

Overrides:

Overrides are useful when one profile  inherits settings from the base profile and thrn adds an override to only few of them.

Imagine you have the base PLA profile for say 'My base PLA'. You create three different profiles from it, one with higher speed, another with higher temperature for the nozzle, another for different bed temperature.

Now imagine that after some tests you realize that the bed temperature is too low andytou need to change it in all profiles - the base and the three modified. With overrides enabled you just need to change it in the 'My base PLA' and all other will use that new value, except the profile which has this setting marked as override - in this ine you need to change it explicitly if needed, or maybe keep as is because it has its own use case/purpose.

Without overrides you would have to update that bed value to every profile created. Multiply it for 30 params for 30 filaments and you need 900 changes, which would be maintenance hell.

You can have overrides on different dimesnion, because for example the same filament may need a bit different settings per printer. Thus you can override only specific setting as needed.

RE: Filament retraction.

Sorry I do not see the Z lift extra options.

Attached a screenshot.

Expert mode. printers. extruder 1

RE: Filament retraction.

the only thing you can adjust is on this screenshot - in the section Travel Lift -> Lift height, which is set to 0mm. There is another option for filament.
Generally AFAIR lift height is auto triggered now in the firmware and may not be adjustable in the settings, only height can be adjusted.
That's why I switched from Grid infill to Rectilinear because things were getting a bit irritating when printing.

RE: Filament retraction.

Hi, sorry but I am not sure what you are posting.

What slicer programme are you using, what version.

Do you have Z hop Z lift options for X Y travel or crossing perimeters etc in your slicer.?

By firmware, are you talking about Marlin or Rep rap etc.

What is AFAIR ?

Why would different patterns of infil make to a  set of Z height retractions settings ?

Thanks

Predominantly I use Rectilinear, I changed different infill patterns, but the Z axis retaction selection did not change.

RE:

I'm using PrusaSlicer 2.9.2 now, and it has the same settings you posted on the screenshot, so there is no explicit option to set z lift after specific traven distance. At first i thought I saw it in the slicer but maybe it was in much older version or different software.

By firmware I mean Marlin or Klipper and so on. I think there may be something in the firmware that raises nozzle a bit on specific moves, but it would need to be checked in the Prusa printers directly in the code (ar least in Prusa Firmware Buddy for mini, mk4, xl, core).
What sometimes helps with certain moves is in slicing options yo select avoid crossing perimeters - it decreases chances of collisions but some people still complain it is not enough.

AFAIR is an abbreviation of As Far As I Remember.

Different patterns do not change z lift. What I noticed is that grid infill causes filament accumulation in the crossings, and this bends upward a bit, so when the nozzle moves over the area it may hit those infill patterns, causing noise or in worst scenarios can move nozzle tip ( prusa mini is pretty delicate) or cause the printed part to detach from the bed. Switching to rectilinear infill solved almost all of my issues.

RE: Filament retraction.

Thanks friend for your rapid response and in depth post.

Good point reference the infil, again I use predominantly rectilinear and it seems to be Ok and fit for purpose.

I have been printing for a few years and I am sure in my old Slic3r programme Win XP 32 bit system, it was 

on the list of choices. Now I am using 100% Prusa Slicer and Win 11. my old system retired a few years ago and gave to a charity shop.

Are there any old timers like me in this forum have a Slic3r  32 bit XP still running to maybe confirm I am not going senile at 78 years of age.

Maybe as you posted it could be in the firmware , possibly a Prusa engineer can sort out this conundrum.

I am almost there as ever anybody can be, fine tuning the angel hairs out of prints, I just hate to take my prints to the barber shop.

Anway, have a good weekend.

Thanks

John