[Feature request]Z full step/mm setting

[liftbag]

Version

2.2.50+

Operating system type + version

any

3D printer brand / version + firmware version (if known)

any

Request

• I just noticed the most recent version of Slic3r has an interesting setting, the Z full step/mm setting
  I've always wondered what level of precision can guarantee the management of continuously variable layers, where the Z axis remains for an entire layer in intermediate positions between the full steps, or in the layers where the supports are generated.
  I believe that Ranellucci's approach (or jenkins?) to the problem is substantially correct.
  I wonder if it was possible to port this optional and experimental setting also on slic3r++.

The version I have reviewed is the slic3r-1.3.1-dev-54a31eed of 2020-01-27, available here:
https://dl.slic3r.org/dev/win/

Is this a new feature request?
Yes

[supermerill]

I just tough of that last week
#219
but it's a bit complicated to implement it well.
Won't be used for vase mode, obviously.

[liftbag]

Won't be used for vase mode, obviously.

Of course :)

[supermerill]

was more work than i though

[liftbag]

was more work than i though

Sorry, I'm a noob about programming. I thought it was possible to bring it directly from slic3r.

[supermerill]

the slic3r implementation is extremely naive (or efficient). And now, prusa added other way to compute layers.

So I use it to round all layers computations and ensure that the manual, the automatic and the standard layers computation (+ supports) are all making z with a multiple fraction of it.

[Czarnyszarf]

What parameters should I use when I don't know the Z steps for my printer?

Can I disable it?

[supermerill]

put something low like the default one.
The gcode won't output a value lower than 0.001 anyway, so it's like disabling it.
I'll change the tooltip to explain that.

[Czarnyszarf]

by the way, setting it as 0 crashes the program :)

[supermerill]

erf, i didn't thought of it. Of course, there may be a division by 0...

[Photogad]

What setting should I use for a stock Prusa Mk3S?

[supermerill]

As there is a Mesh bed leveling, the z stepper are never at a fulls tep, so if you want to use this field you need to know the microstep.

based on https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/motor-step-angle-and-screw-pitch-for-mk3-1.8-and-.8mm/, 0.0025