Slic3r setting 7800 feedrate for Z movements. Stumped

so. everything i slice comes with 7800 feedrate for the z axis, which is way too much for my motors.
I've looked at similar posts in the forums but i couldn't find an answer to this, and i've searched the slic3r configs without any luck.

Recently i've opened the marlin code loaded in my printer and searched 7800 in all sketch tabs but found 0 coincidences...

i'm really stumped.. thinking about writing a script to modify every line manually, but i'd like to fix it for good tho..

any ideas?

Slicers assume that you have configured suitable movement speed limits in your firmware, so they often command high speed travel moves knowing that your fimware will limit it to a speed that your machine can manage.

However, I've not used slic3r for a while, so maybe now it has a separate setting for the speed of Z moves.

Edited 2 time(s). Last edit at 04/10/2018 05:52PM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

maybe that's the problem, cause i had been printing fine until i started messing around with the firmware to install a z probe.

is there an option in the printer to enforce this limit?

thanks for the reply

[github.com]

in the link i've found the problem.
In the config file i have to treat the default acceleration limits as units/sec2 and not mm/sec2. I had that setting way too high for this units. I'm playing with it but i can now safely run the command that was messing my gccode (namely, g1 Z## F7800)

Quote
#define DEFAULT_MAX_FEEDRATE { 300, 300, 5, 25 }

With Z steps/mm set at 4000 the 5(z max feedrate) is way too high, change the 5 to a 2 or possibly 3.

Quote
ansiomatic
[github.com]

in the link i've found the problem.
In the config file i have to treat the default acceleration limits as units/sec2 and not mm/sec2. I had that setting way too high for this units. I'm playing with it but i can now safely run the command that was messing my gccode (namely, g1 Z## F7800)

Can you post the changes you made to your config file?

I believe I am having a very similar problem...
I found this forum when I was searching how to change default Feedrate from F7800.
I've learned that my Z-axis stutters and freezes when feedrate is 200 or greater...

This is affecting my ability to home the Z-axis or successfully print anything.

If you're able and willing to post your exact configurations relating to Z max speed, it would be greatly appreciated.

Thanks!!